Remaining yaw offset after VTOL back transition

Hi everybody !

I am using a VTOL and I am trying to tune front (MC --> FW) and back (FW --> MC) transitions. The front transition seems to work well now, but I have an issue with the back one. Indeed a yaw offset (in FW orientation, so a roll offset in MC) remains after the back transition, causing a saturation of the rudders that reach their maximum. I don’t understand where this offset comes from and I would like to get rid of it.

Here are some logs where you can see the issue :

Does anyone ever heard about this problem or have a solution ?

Thanks for your help !