Agreed. The blades are probably pinching and pulling.
My mare LOVES being clipped. She closes her little eyes and pushes into the clippers. But, she'll tell me as soon as they get dull because she'll pull back while she's being clipped.
Just a note - Remember everyone is here to help. No one is treating you like you are stupid. This is a public forum, and you have the option to take offense or not. You asked for help, described a problem, and people are going to be honest with you.
Pssh.I didn't pick up the wrong lead
It's called a counter canter...
...A very advanced maneuver.