Are my Biceps broken ???

[NBMass]

Hey guys im having some trouble in the gym right now with my arms and im hoping some of you can help me figure out why. It feels as if my inner part of my bicep is over developed compared to the rest(i think due to hammer curls). When i do straight bar or E-Z bar curls my arms stop 3/4 thru. Not due to power tho, they just fail out and its a struggle to continue the curl. I have no problems what so ever when doing single arm dumbell preachers or standing, and hammers. What the hell is going on! Has this sort of thing happened to anybody or am i just loosing my mind? Also what are some good strength building routines that i could use to help boost my power on such exercises??

[Double3]

Squat