When I drag object thanks to PinchHandler (2 fingers minimum) and after I drag object with DragHandler (1 finger only). Object starts to be dragged (DragHandler) in a bad position (PinchHandler drag start position).

You can visual example above. (Step1 -> Step2 -> Step3 -> Step4 (result) )

I tried to debug in Qt Source and I found that "onGrabChanged ("qquickdraghandler.cpp")

 function is called when I release one fingers on my object. When this function is called, "initializeTargetStartPos" is called too so  m_targetStartPos is set.

After, when I start dragging object (one finger only, so it's using DragHandler), m_targetStartPos seems not good to realize translation.

I hope my above explanations whill help you to solve this problem.