auto mix on with jump to cue point on problem DJay Pro on Ipad

I have problem with automix on when jump to cue point is turned on.

My duration is set at 3 seconds, and Trigger before end is set on 20 sec

The problem then is that when it start it will play the song for 3 sec the switch to the next song in the another deck. It that song will play for 3 sec and we go back and forth…

What is going on???

If i turn off Jump to cue it will play the song to finish then switch over… Not 20 second before it ends.

have i missed something?