Double positions in league history

I've just noticed that some teams in my league (Greek Superleague) have double positions in the same year assigned in their league history. I've asked this question on reddit and was told it's because I use an updated database, but some people have the same way and don't have any similar problems.

Do you know how to fix this?

Here's how it looks like: http://imgur.com/a/dlMTG