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Well you should give some more info on your problem.

It is hard for me to give you more info because I don't quite understand your problem.

Well actually you said the same in the first post
It is very strange behavior, must admit I never seen it before.
Maybe some SEO extension you use causes this, is it possible?
When you add a menu item you can also define an alias for it, hav you tried to set, for example "gallery" and see what happens?