Ok, so I'm 16 years old, and I've been lifting for 8 months now.
Just this week I've started using the 80 lbs dumbbells on the dumbbell shoulder press, as the 70s are too easy.
My problem is that I can now shoulder press an 80 lbs dumbbell for 3 reps with my left arm, but only for 1 rep with my right arm. I find this odd, because I'm right-handed, so if anything, I should be pressing more with my right arm.
Looking forward on receiving helpful advice from you guys on how to fix this problem.