I’m assuming you have updated the theme to 2.4.4?
As there was an issue with masonary & ajax portfolio issues but has been resolved in the newer version.
Regarding sorting by date i’m sure its set automatically by the portflio entry “entry number”.
As far as i can tell.
You need to go into admin panel> apperance> menus
Check the “Home” link is set to go to the correct location/page.
If you don’t have amenu set up using this i’d advise on doing so as its easiest way to maintain and can have the option of megamenu.
On a side note your “home” menu button goes nowhere the link is incorrect.