[Users] Duplicate incoming message into two different folders

[Paul]

On Tue, 16 Jun 2015 09:29:52 +0000
anton92 at gmx.ru wrote: 

> I am running the latest Claws Mail on Linux.
> I have just noticed that my messages get duplicated, and the second
> copy is placed into an unrelated folder. That is, each message is
> placed in its folder and in another one too.
> I cannot understand the reason for this, since I am not using any
> filters.
> Any ideas?

Is this IMAP?
Is the 'other folder' the same folder for every message?
If yes, then it looks like a server side rule.

with regards

Paul