Default obb folder


I have a problem, i can't move file to obb folder because i can't see it BUT i can't create a folder with that name because that said it already exist, so how it's possible that it already exist bu i can't see it?
even with file manager on the tablet or directly with my comp i can't see it.

EDIT : i've fixed it by searching it in file manager with root access then magically the folder appear ONLY with this way...
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Sony Xperia Z1 - C6903 - KK 4.4.4 Stock - Sony Xperia Z2 Tablet Stock ROM