Yes it's likely because you used a shimano bb which is probably JIS taper with a campy crank which is ISO taper. I say probably because the more I learn about bb and crank taper compatibility, the less I know. Apparently there were years when campy cranks were closer to JIS taper?? but I'm highly confident that is probably the issue. If the bike rides fine you could ride it as is, although some may caution that doing so might damage the taper on the crank and I am one of those people, but it's your bike! Sheldon has a great write up about this and he states most people make too big a deal about this stuff.

Hope this helps!