After you import a view from another model, clean it up. There is a chance that it brought in some new annotation styles, or detail items. Change them all to corresponding elements already existing in your model, and then delete the newly unused ones that just came in.
One of our most notorious examples is the infamous Break Line. Each drafting view we imported had a copy of the break line family. By the time anyone noticed, the project model had “Break Line (1)” through “Break Line (22)”. We have since updated our details to avoid detail components and be exclusively linework, but something always seems to slip by.
A clean model is a happy model!