A quick question, when u use hip drive doing squats, does it look deliberately done and resembles the hip thrust when u, ehem, u know, sexy time?

Hi guys

I'm find one thing funny, my biceps seem to be weakening. Previously I used to lift 12.5KG for hammer curls and seated concentration curls and I can do 8-10 reps for 2-3 sets.

Recently I find that I can't even do 6-7 reps

And the more funny thing is, my right arm which is my dominant arm (the arm I use to write, take stuff etc) is lifting lesser reps than my left.

Left arm seated concentration curls:
Set 1: 6-7 reps
Set 2: 5-6 reps
Set 3: Maybe 4 reps

Right arm:
Set 1: 5 reps
Set 2: 3 reps and struggling already

Anyone experienced something like this before?