I have been doing weights for a while now and my Biceps are beginning to increase into the shape of a circle instead of being even and larger. I can't describe exactly how they look but it is like a bubble. And I think there is a reason for this and if there's a way to prevent it.

Biomechanics and genetics. Sorry to say, but you can't fight it. Everyone has a different shape to their body and specific body parts. We can't fight genetics. We can only TRY to change what we have by doing some specific exercises.

If you are missing your biceps peak, then try doing more concentration curls to help emphasize the peak on both the short head, and long head of the biceps. It may help slightly, but it won't drastically change what you already have. Good luck.

Yeah bud, massnutri is right. You can however try to elongate which is what it sounds like you want by stopping your curls at about 45 degrees and staying away from the CRUNCH at the top... it won't work miracles, but it will help in a month or so. Good luck my man!