Mail - junk mail duplicates in inbox

[wmth99]

All of a sudden, my junk mail (Mail app) that automatically goes into the Junk folder most of the time, is duplicating into the inbox as well. So now I have the junk mail in the Inbox and the Junk folder. I don't know if i accidentally did something in settings or what? Thanks.
(Mac 10.11 El Capitan)

 

[lrmd98]

Following this thread, as i'm also encountering this issue on one of my macs.