Jerky target Roll when in RTL

Hello !, im on the way of calibrating a sky Hunter ( using a kakute F7 as FC, with Beitian BN 880 GPS), 900 mhz telemetry radio ) , by doing ground testing , all manual modes seams to work fine , when trigger RTL , aileron servos goes up down by + - 10 deg instantaneously , I know this test is strange as plane is not flying , so my question is first , if i can really test auto modes on ground , and expect a "normal " , not crazy behaviour , and in that case if you have any recommendation on how to proceed . I do see that the beahaviour is on the FC logic , as the servos are doing what the target roll is asking them to do . , thanks a lot for your time to read this .