RobotStudio event

TCP position error/AWPP bug

Hello,

I've been tinkering with S4 robotstudio and awpp for few weeks now. I have some problem with TCP and welding torch model witch apparently don't stay in positions where they should. I've got instruction how to place tcp to correct position. I've done the correction few time but it looks like tcp somehow move small increments by it self?  I'm I somehow causing this or is it about software?

Regards Aku