calibre cannot and will not see books located in obfuscated app storage, as the OverDrive app does.
There is no fix, and really, there needn't be, not for library books.
I would suggest using another ereader app, which stores books in standard locations. Moon+ and Mantano are both popular here.
You may also wish to look at Calibre Companion, which does a phenomenal job integrating Android devices with calibre, exposing all of calibre's metadata, custom columns, and more, on your tablet. The developer is a longtime MR member and calibre code contributor, and very responsive to input.
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