BPM Autosync does not work for some songs (Djay pro for Ipad)

Whenever I am playing a song on a deck and I want to switch over to the other deck, the autosync feature seems to not work as the songs are out of sync. However, sometimes it work. I have the autosync feature on. I don’t know what the problem is.

Also, whenever I am playing a song and I want to skip to the later part of that song (or an earlier part), there seems to be no transition effect (i.e., crossfade). Maybe there is one but I am unaware. If there is, please inform me about it or put it out as an idea.