You mean it moved around on the block? Yeah, with a smaller stamp that sometimes does happen. Or a long thin stamp. Some of my clings flip off when I clean them on the scrubber. Then, you have to put them back on and restamp the plastic on the positioner. Annoying.
My favorite annoyance is when I'm using a stamp with no "top or "bottom" and after I stamp on the plastic, I forget which side of the block is supposed to be up and have to start again.
I actually stamp most of my images on my stamp a ma jig in Memento black, no matter what color ink I'm actually using. It makes a crisp image and is easier for me to line up. But then my eyesight far from great.