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Yes that the original is still in the original location!By "just copied" do you mean that the original is still in the original location, or that the data have moved but the app doesn't work?
In the latter case I would guess that the new folder on SD is not linked properly to the internal location. In the former, are you sure there are 2 copies, rather than your file manager following the link and so seeing the data in both locations?
What other programs have to move the cache?I've not used foldermount, but are you certain that the file manager isn't just being fooled by the link? If you use a terminal emulator and the command "ls -l <original file's location>" you should be able to see whether it's really there or is just a softlink, or some file managers can tell you that if you long-press and ask for details or properties.