Is It Normal Not to Feel Anything when Doing Thermage CPT Treatment? - Hong Kong

I had a Thermage CPT 1200 pulses treatment to my face yesterday. While the machine was working on my right side of the face, with an energy level of 4, I felt a very very strong sensation. However when the machine started working on my left side of face, it gave me no sensation at all, with the same energy level of 4. So I asked to increase the level to 6.5, still, I didn't feel much at all, but the machine seemed working normal until all 1200 pulses are used . Because of the lack of sensation, I suggested that the machine broke down, but the service provider strongly denied it. Can any experts advice me on this? Thank you so much!