This can be caused by several issues.
Make sure you use suitable cloth and that it is stretched very tightly.
Apply pressure. The foot most touch the coth, always. Push harder then you think you need to. Move in the direction the foot curve is facing.
if this does not help, check your manual, if your foot is place to far at the front, the scissors cannot reach trough the cloth and will cut your fabric.
Find more infor on :https://tufting-community.mn.co/posts/faq-holes-rips-tears