Start search on this site : every 2 weeks this question is asked ... it's really boring !
EDIT (after close):
The link for installation from Wiki is OUTDATED (as you could read : Debian 9, Centos 7 !). You have to follow more recent and complete tutorials (especially for Redhat family distribution) ...
Starting from 2.8, It's mandatory to have cron tasks for computing count of softwares !
Many users don't follow instructions about these cron tasks, and this is the usual reason for 'software empty'.
I'm quite surprise by PHP 8 requirement for 2.12.1. (Also definitively I prefer Debian family distributions : it's more easy to have a correct installation with all relative components)