I run many portfolios – and I have never seen such a fatal error on my websites. As you mentioned, there are no other messages about this on the forum.
What exactly are you changing manually? – Do you have any custom post types running?

on : avia-snippet-widget.js i commented out the first regex – hope that this will not come into conflict with other settings.

function av_pretty_url(text)
{
	return text.toLowerCase()
		// .replace( /[^a-z0-9]+/g, "-" )
		.replace(/ /g,"_")
		.replace( /^-+|-+$/g, "-" )
		.replace( /^-+|-+$/g, '' )
		.replace(/ä/g, 'ae')
		.replace(/ö/g, 'oe')
		.replace(/ü/g, 'ue')
		.replace(/ß/g, 'ss');
}

see: https://webers-testseite.de/datenschutz2/
for example datenschutzerklärung

download it here (both files min.js too) : https:://webers-testseite.de/avia-snippet-widget.zip

you know how to have child-theme js files?

first: on fontello there is on top the option to give them a name.
second: before uploading – rename those zip files to something reflecting the icons ( as on enfold : enfold medical icons etc. )
( This is only to have in media-library a meaningfull name – not important for the function )
see: https://kriesi.at/documentation/enfold/icon#download-fontello-or-flaticon-icons-included-in-enfold-demos

PS : inside the zip-file there is a folder with fontello-123456xyz – you can leave that. important is to rename the zip file and the font on downloading on fontello.

it seems that you have all pages with transparency option ?
so you can overwrite the behaviour to show now the alternate logo anyway. on all mobile devices
This is merely an emergency solution now

.responsive.avia_mobile #top .header_bg {
  opacity: 0.1;
}

.responsive.avia_mobile #top #header:not(.av_header_transparency) .header_bg {
  opacity: 1;
  background-color: rgba(0,0,0,0.2) !important;
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
}

.responsive.avia_mobile #top .av_alternate_logo_active .logo a > img, 
.responsive.avia_mobile #top .av_alternate_logo_active .logo a > svg {
  opacity: 0;
  width: 200px
}
.responsive.avia_mobile #top  .logo img.alternate, 
.responsive.avia_mobile #top  .logo .subtext.avia-svg-logo-sub {
  display: block;
  opacity: 1;
}
.responsive.avia_mobile #top  .logo img.alternate, 
.responsive.avia_mobile #top  .logo .subtext.avia-svg-logo-sub {
  display: block;
  padding: 10px 0;
}

.responsive.avia_mobile #top .logo img.alternate, 
.responsive.avia_mobile #top .logo .subtext.avia-svg-logo-sub svg {
  top: 50%;
  transform: translateY(-50%);
}

nevertheless – you had to find the reason for that url mismatch – and why the normal logo could not be overwritten by a new uploaded one.

you uploaded that svg file from the Flaticon zip to fontello.
Do you have any warning on uploading? (Compound path … )
Are these icons monocolor icons?
Do you see the icons on fontello as you like to have it?

like this: https://kriesi.at/themes/enfold-2017/#best-rated
but you know how to insert those icons – the only problem is to get them centered – allthough you have tried using the text-align feature of the editor?

Link

have a look at this small plugin: https://gitlab.rrze.fau.de/rrze-webteam/rrze-post-expiration
(GNU General Public License v2.0 or later – so you can use it)

you will have then on all posts under publishing the post :

after expiration those post/pages goes to an extra “Expired” State.
PS – there is only the setting for post/pages not for portfolio. BUT only two places in sourcecode can change that to have it for portfolio too.
/includes/main.php (line 86 – add to the array ‘portfolio’ )
and
/includes/settings.php (line40 – add a new line with portfolio)

What have you inserted to your :
Dashboard – Settings – General : “WordPress Address (URL)”. and “Site Address (URL)”. ?

why does logo image url differ to domanin url?

https://october7coalition.org

on mobile the normal logo (non transparency case ) is shown and this leads to :
https://october7coalition.org/wp-content/uploads/2024/01/logo_black.png
on desktop the transparency logo is shown so the alternate logo inside sub-text is there.
https://october7coalition.com/wp-content/uploads/2024/01/logo_black-300x133.png

you can have on child-theme functions.php :

function add_slug_body_class( $classes ) {
global $post;
  if ( isset( $post ) ) {
    $classes[] = $post->post_type . '_' . $post->post_name;
  }
  return $classes;
}
add_filter( 'body_class', 'add_slug_body_class' );

then a post/portfolio/page will have on body (#top) an additional class f.e.
post_name-of-my-post
portfolio_name-of-my-post
page_name-of-my-post

maybe that helps you to better select.
On your example page it will then be : post_sand-box-post

why do i include to that class the post-type? because it might be that you have post and a page with same slug – then you can differ between them
if you do not need that – remove the instertion of the post-type:

function add_slug_body_class( $classes ) {
global $post;
  if ( isset( $post ) ) {
    $classes[] = $post->post_name;
  }
  return $classes;
}
add_filter( 'body_class', 'add_slug_body_class' );

you can have both – column sticky and sidebar sticky

.responsive body#top.postid-335 {
    overflow-x: visible;
}

#top.postid-335 #wrap_all {
    overflow: visible;
}

@media only screen and (min-width: 768px){  
  #top.postid-335 .entry-content-wrapper {
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
  }

  #top.postid-335 .entry-content-wrapper .flex_column.first{      
    position: -webkit-sticky !important;
    position: sticky !important;
    top: 100px;   /*** depends on your header-height after scrolling ***/
    min-width: 120px;  /*** you can have here absolute Values  ***/
  }
  #top.postid-335 #main div > .container {
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
  }

  #top.postid-335 .sidebar{
    position: -webkit-sticky !important;
    position: sticky !important;
    top: 60px;   /*** depends on your header-height after scrolling ***/
    width: 30% !important; /*** you can have here different width than on global settings of Enfold ***/
  }
}

see here the example page for sticky sidebar with code : https://webers-testseite.de/sticky-sidebar/

Try to make a screenshot of your enfold layout you like to have. Or describe it better.

On your sandbox the parent element is the entry-content-wrapper
now you like to have the first column to be sticky and the second one scrolls. The sidebar on the right should scroll away too?

this is just the lato activation by enfold google font support? (just selecting it from the drop down menu – on general styling – fonts)
can you show me that page where it is not changed to the correct lato font?
how did you enter those special characters.
Can you try to use the unicode html entity & #262; (without that space between ampersand and #)
Lato is designed by polish Łukasz Dziedzic, so I can hardly imagine that this font is not equipped with diacritical marks.
but reading f.e.: https://stackoverflow.com/questions/51707185/font-lato-bolded-some-czech-characters – it seem that some characters with Caron (Hatschek) are printed bold – instead of normal.

but that C with Akut is there :

• This reply was modified 2 months, 2 weeks ago by Guenni007.

on mobile less than 767px – is it intentional that the logo is that big?
because the header height and all line-height are set to 80px but your logo is set to 120px.

if you like to have an overlapping logo like:

then you need some extra css.