Hi Jasmin,
This has been going on for ages, through various versions of WordPress and your own software updates. Very buggy, but I note you have fixed a lot of the previous huge amount of errors. I sometime have to disable this software to be able to work properly.
PHP 8.2.19
WordPress 6.5.5
Secure CP 9.45
https://professionalphoto.online is where we use the CP.
We can upgrade to PHP 8.3 but have not done so as yet as its fairly new.
Regards
Dane