iCloud mail keeps moving back to Junk folder after been marked Not Junk

[JPK]

This has been happening for months. Stuff will show up in my junk folder that is not junk. I will specify it as not junk and move it to my regular folder. A day later it all shows up in my junk folder and is getting cumulative and becoming a real pain in the butt.

Anyone else experiencing this or have any ideas what I can do to stop this from happening?

JPK