Using New Outlook on Windows for professional communication and productivity
Starting from approx 6 weeks ago I also have this problem.
I now have the Junk Email Setting set at 'No Auto Filtering' but emails from senders that are in the Safe Senders List (and have previously never been a problem) are now being trapped in Junk.
As I have opened each of these emails in Junk, I have marked them as 'Not Junk' but this has no bearing or positive effect on future emails.
One of these I just marked as Not Junk went to Inbox and then came straight back into Junk.
I am using Outlook Classic.