Rotary setup odd problem

I have a Ortur Master and the Rotary attachment they sell for it. I have started the setup for the rotary using the video from “The Lousiana hobby guy” (very good). Where things go wrong is when I try to frame for the test cut the rotary takes off for about 2 full revolutions then does the frame action, which is off. When doing a normal etch and the frame is done it moves a very small amount and starts the framing fine. I don’t understand the large amount of motion in the rotary function.
is this normal???