sounds like your radio set to the stunt trim option (the 8103 has this option) and has a different tail trim in stunt 1, set the trim the same in all stunt modes. if you have to change trim from one day to the next, set all modes the same and then you can reset the neutral point of the gyro with it on by flipping between norm and HH 3 times each with one second intervals and on the last flip leave it in HH, it'll reset the neutral input for the gyro and you can continue flying.

kc

EDIT: if you have a 'DT' (digital trim) this function is not in the menu but you'll have a different on screen trim in each flight mode. look on the screen and watch the tail trim as you change flight modes, you should be able to see the trim lights move if they are different in each mode.