I had a funny problem that turned out to be a tuning problem with the spectra module.

The direction of the elevator to flaperon mix would change after programming. The first time it occurred, I thought I had inadvertently caused it. However, it then happened several times later.

I sent the transmitter to Hitec & they "tuned" the spectra module. No more problems.

I don't know if this could be your problem, but it sounds similar. I recommend sending the transmitter to Hitec to check it out.