Sudden divergence in the desired roll and pitch

we fly our plane twice, first time, the desired roll and actual roll like this,


it crashed, and baro.alt is 0
this time, the desired roll and actual roll like this,

what may cause this difference, thanks
sincerely

we can only help if you post log files

Dear
This is the crashed log

this is the normal log

Dear
thisi is crashed log

this is the the normal log

If you could not get the file, please note me,thanks

Dear tridge,
Is the mechanical error caused the crash? thanks!

The reason for the discontinuous change in DesRoll is that the aircraft changed to RTL mode and began to turn.

Your logs indicate that the sudden change in attitude just before the crash was just following the input from the transmitter (RCIN). The following video shows only roll, and same for pitch.

thanks for your relpy, hatnac
I checked in mission planner, maybe the mechanical failure caused this crash
sincerely