Bicep curl problem?

i can curl 30lbs. with one paw
but i can barley curl 50lbs. with two mitt
shouldnt i be able to curl 60lbs near 2 hands.
do any of you guys hold this same problem, and why is that?Bicep curl problem?
Just one hand stronger than the other. I'm right hand so my right arm is a stronger than my left. If you want to go together out, work your weaker arm first, and when you do the stronger arm, only work it out to the height that your weaker arm is at.
yeah that can be a problem when you lift free whieghts , next to out noticing it you can be working out your right paw allot more than your right hand , because when your fell the pump you loose count and what not. your arm strenght is uneven so , from immediately work out your weaker hand a touch more frequently till it evens out.