When I rotate foot, leg, hip, etc with full commitment, and when I do it for 2 punches (one two, jab & cross), I get a delay before the second punch (cross) starts.

My mma coach says to not to put in force for now (I am at the fix-form stage from mostly self-taught trainings & only 6 month long boxing training years ago), and I have no problem throwing 2 punches smooth & fast that way (without full commitment).

But at home, with my own punching bag, when I throw 2 consecutive punches with full commitment, when I switch the arm & hip direction, I kind of feel my hip dragging behind a little. Do you know what I mean? It's like I am feeling the residual effect of the left jab's hip rotation while doing the right cross's hip rotation.

Is this normal, or something that can be fixed without losing the full commitment in both punches?