It's not possible to help you with such sparse description of the problem. Like which airplane you use, for example.
I don't see any particular issues with either kind of jetways and, it's not possible that a jetway would fit perfectly on any airplane, since the jetway animation system doesn't know anything about the actual size/curvature of the airplane fuselage, so you always have a bit of misalignment, but of course without a better description/screenshot, it's difficult to know if yours is really a problem, or is still within the normal and expected margin of error.