Jumper mixer problem

Jumper TBSG Plus.
I am trying to change the source on the simple mixer page like say from rudder to aileron, the source shows aux4 and it will not change when I press the right and left buttons, it just sticks to the aux4 instead of moving to the source that I want. The source box "jitters" a little and is not steady. Can someone tell me how I can fix this? Deviation FW version: t8sq_v2_plus-v5.x.x-2018-04-19.
Thanks,
Ben

make sure you hit "Save"

apparently using 4xAA can cause jitters

Thanks pzcato I deleted the model and started over and when I calibrated it I put the aux4 in the center, that seemed to fix it and it is working OK now.
Ben