Mixes playing different versions of the same song

Im not sure if this has to do with me being a new user, but I've noticed that when I create a mix from a song, it will include alternate versions of the source song in the mix. And sometimes, even back to back (see the attachment).

Am I the only one seeing this? I've only been using Deezer for 3 months, but still was not expecting something like this to happen.