Steve wrote
Could it be possible for the flaps to have an asemetric configuration
that could be causing the turn?


Yes it can, Steve. A good point, even with flaps that move with the ailerons
(ASW-20, etc.) The flap misalignment may cause a turn. That is to say, if the
gap between the flap and aileron (on the left side) is greater than the gap (on
the right side), the added drag on the left side may be the culprit.
JJ Sinclair