problems with specific site...

hello all,

this site came as a backup from cpanel or plesk… i dont remember… Migrated normally and a few weeks ago redesigned and moved to a new Virtualmin server.
the specific server, has only php 7.3 and a test site, which runs in every php mode.

My problem is that the migrated/restored site runs only in Apachemod_php (run as Apache’s user) mode.
When i try to use CGI wrapper or FCGId php does not execute, but offers the page for download.
When i try to use FPM it timeouts…
Probably there is a forgotten setting somewhere…

As i told before, i created a test site, with wordpress, etc. and it works fine in all modes.

can someone help me or direct me what to search ?