That's the only thing I can suggest to do. I looked around for quite a while, actually, and there is very little to say about this, though several sites acknowledged that this can happen when there are multiple external or internal style sheets (two of the same, of course). And what was confusing was I saw different info about it. Some seemed to imply that the first referenced style sheet had priority, but most said "the more specific" one, whatever they mean by that.

There was also talk about a "preferred" style sheet, but that's a case of one sheet or the other, I think, as in when a user can choose how your site is displayed.

Good luck