Coach keeps telling me to “lay off the heat”?

I joined a new MMA gym after I moved recently.

During pad work and instructed/drill sparring in an “all levels” class, one of my new coaches has now told me 3 times to “lay off the heat”.

I am a 100lb, 4’11 female, and my partners are average to large size men.

Is this reasonable? I don’t think I’m hitting them very hard. Even if I were, I can’t do much damage given my size and gender. Why does he keep telling me to take it easy on them? At my last gym they encouraged us to knock each other around a bit and take some damage to toughen us up.

EDIT: Alright, alright, I get it, I went too hard. Focus on technique. I wasn’t trying to hurt anybody, I never go 100% unless instructed to, and I always check with my partner to make sure they’re comfortable with the amount of power. I will say that if you guys could see me, I’m a weak lil thing, but I got it.

EDIT 2: Ok turns out this coach says it to everybody. I had a guy barely hitting me tonight and he still said to go easy. Thanks for the feedback though.