Duplicate emails in Inbox !!??

[how2b]

I recently started receiving duplicate emails to my inbox.
It doesn't happen with my Spam box.

Can anybody help me to stop this happening please.

Thanks to any and everyone
How2b

[JohnDoh]

Does it happen in other IMAP clients or only Roundcube? That should help identify if its a Roundcube issue or a server issue.