Issue Problem with moving detected Spam in the spam folder

[Liwindo]

I have since a few weeks the problem that my as spam detected mails are not moved correctly into the spam folder but remain in the mail folder.
I tried to uninstall and reinstall SpamAssassin and MagicSpam Protection, I tried other options of these programs but all this did not succeed.
Any ideas?
System: Ubuntu 14.04.5, Plesk 12.5.52, SpamAssassin and MagicSpam Protection enabled