A lot of it could be genetic, some body parts grow like weeds and others are really stubborn. Your own growth patterns will be much more apparent when you go on an all-out bulk. I personally didn't think it was that odd for someone's calves to be bigger than their biceps, seeing as how my calves are 16 inches and my arms are like 12, lol, but i guess that means that arms will be a major weak point.
I also remember reading that the insertion points for calves is inversely relational to those of the pecs. So if you have really wide pecs, the insertion points for your calves will be lower, making them appear to be longer and thinner, thus making it harder to get a lot of width on them. It's not impossible; i've seen dudes with low calf insertion points with gigantic calves, and the low insertion actually makes them look bigger when they do get that size. It just might take more work than say, your traps.
Incidentally, this also applies to women's breast size. So if you see a chick with really big boobs, check out her calves. They'll probably look small or thin. Or, if she's really flat-chested, she might have curvy calves. Y'know. If you're into that sorta thing. lol
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