Torch lifts during cut

I’ve seen a few topics on this issue but just wanted to make sure what is exactly going on . My torch lifts at same spot near end of cut . I ll cut a monogram sign and when it does it’s final circular cut about half way the torch raises up . Stays lit but raises too high to cut . I am going to screw around with some stuff tonight . Just seeing if anyone has the latest info or same experience.

What live voltage are you seeing when this happens?