[Evolution] Duplicate spam

[dean <deanshannon3 gmail com>]

Hi guys,

Evolution 3.12.9, debian 8, IMAP account.

I am having a problem with duplicate spam on one of my accounts. I have
tried deleting, selecting "remove duplicate messages" and expunging the
folder but the messages will reapear after moving away and reslecting
the folder, checking the webmail the messages are still there. The
messages seem to increase and previously have filled my mailbox quota. I
have "check incoming messages for junk" off. The last time this happened
i had to clear the messages, shutdown evo and delete them using webmail.
I have two accounts on this server and have only seen this happen on
one.

So how do i debug this and stop this from happening?
ps screenshot of the folder: http://imgur.com/zIlAi8X

Thanks
Dean.