Abdominal charlie horse with Emsculpt?

Hello, I am 125 lbs. 5 years post 2 c sections. I recently had an emsculpt consultation and the provider wanted me to test therapy just so I could feel it before treatment. I had an intense charlie horse cramp in the same place in my right abdomen both times she trie the treatment. She stated the machine was only at 18%. Treatment had to stop so I could massage the cramp. What could be the reason this happened.