if i want left trim i have to push right trim its reversed I have flown the plane many times once in the air when I went to trim out the roll it just got worse thats when i realized its reversed on the TRIM tab only. I have the servos working in the correct direction. If you are not familiar with this TX please dont try to help.
Not sure if you corrected this issue yet, but I had this problem a while ago on the elevator servo with my T16. Do you have individual servo's for left and right aileron? If so, try this. Move the servo arm 180 degree to the opposite side of the servo. You'll have to reverse the servo direction but if my memory is correct the trim will now follow the in the correct direction. I have no idea why this seemed to fix my issue but hopefully helps you out.