and if you know what you like to have use a filter : https://kriesi.at/documentation/enfold/masonry/#change-the-sort-order-of-masonry-elements

or this child-theme functions.php snippet ( or is it deprecated in 4.6.3.1 ? )
https://kriesi.at/documentation/enfold/blog-post/#how-to-add-an-orderorderby-option-to-the-blogpost-sliderportfoliomasonry-grid-element

Many hosters are now forced to switch to higher php versions. Most notify you that the 5.6 versions will now be disabled, but not all. I don’t remember when the enfold versions needed newer php versions higher than 7, but maybe that’s the reason.

Then: did you disable Gutenberg (Block Editor)? I only use the Classic Editor setting with Enfold:
Enfold (Child) – Theme Options – Select Your Editor

the first thing when activating Enfold as theme i do insert this to my child-theme functions.php:

function admin_head_mod() {
  echo '<style type="text/css">
  #avia_quick_css .avia_description {float: none;margin-bottom: 20px !important;padding-left: 0 !important;width: 98%}
  #avia_quick_css .avia_control {float: left;max-width: 98% !important;width: 98% !important}
  .avia_footer_links li {float: left;padding-right: 20px}
  .avia_footer .avia_footer_save {float: left}
  .avia_reset {pointer-events: none !important }
  #avia_options_page { max-width: 3000px!important}
  </style>';
}
add_action('admin_head', 'admin_head_mod');

or in that code abbove set .avia_reset to display:none

it disables the reset button and let the quick css field and the whole options page grow to max width.
The quick css is to narrow for some selectors.

sorry : both sites
a) https://www.bellarinepeninsulaaccommodation.com.au/
b) https://www.greatoceanroadaccommodation.directory/

I’m sorry I’m saying this now, you think you should play it safe and start over.
So-called Nulled Themes can also put code into other folders (of course also into the wp-content folder etc.).
For me the risk would be too high. Therefore : even the database should be completely rebuilt. And also upload a new WordPress. Sounds paranoid, but it would be too unsafe for me to invest too much work and then be blocked by Google because the site sends tons of spam.

Please do upload a complete new Enfold Folder like here: https://kriesi.at/support/topic/some-hints-and-advice-to-update-enfold/#post-1056107

Because: Pirated (Nulled) Themes do often includes malware or spyware.
so to be sure that there is no additional code in your enfold folder – this was my advice.

PS both sites are still on older versions: the one on 4.0.5 the other on 4.4.1

Yoast does it right if it does not count the backgrounds as images. these are in css not in the DOM as img tags.
Yoast only looks if all img tags have alt attributes.

the thing is – that background-images do not have alt tags – or do you see in your source code an image tag?
i can not believe that a seo tool (i use for bigger sites Yoast Seo – and others for smaller sites ) would find this as fault.
May i see the concerning site?

but you are sure, that you have inserted the higher resolution to your site?
on The image Alb element or other image based ALB Elements of Enfold – you can choose what resolution is shown f.e.:

there is no automatic load of the child-theme replacement files:
there is a child-theme functions.php snippet that induces the replacement: https://kriesi.at/documentation/enfold/intro-to-layout-builder/#add-elements-to-alb

the place then for the substitutes is: child-theme/shortcodes/

in this case i would overwrite the parent theme file – because it will be fixed in next update

What you always can do is not to use the google maps ALB Element – but the codeblock element and embed the iframe given from Google Maps ( there is an embed button on share the map )
The only thing to change there is the width to 100% and the wanted height !
Then insert to the codeblock element your borlabs short code and the iframe inbetween:

[borlabs-cookie id="googlemaps" type="content-blocker"]<iframe src="https://www.google.com/maps/embed?pb=!1m14!1m8!1m3!1d2524.0265485697782!2d7.0528674!3d50.7565414!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x47bf1e2abeab2637%3A0x2a80c2a108fded35!2sLudwig-Schopp-Stra%C3%9Fe%2027%2C%2053117%20Bonn!5e0!3m2!1sde!2sde!4v1572797232411!5m2!1sde!2sde" width="100%" height="600" frameborder="0" style="border:0;" allowfullscreen=""></iframe>[/borlabs-cookie]

And by the way – this could not be the correct usage of the font name in css? – with file-extension?

how to add a custom script to enfold – see here: https://kriesi.at/documentation/enfold/add-custom-js-or-php-script/#add-a-script-to-footer-section

or if it is a post with post ID (be carefull it is a class) like: .postid-2553