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It can't be a problem in my design if F5 changes it right?
If refreshing changes it, and if the other browsers you cited are getting it right, then I'd say it can't be your design. At least, it's not an error in your design. There might be some aspect of the design that's triggering a bug or instability in Opera, but that's sure not the kind of problem I'd like to try to track down . . .
Also, if javascript plays into your layout, Opera's javascript support, though getting a lot better, does have a few holes in it.