According to Overdrive help info:
Quote:
Can I return items early?
Due to publisher licensing agreements, OverDrive media titles cannot be returned early. They will automatically be returned at the end of the lending period.
Due to publisher licensing agreements, Mobipocket titles cannot be returned early. They will automatically be returned at the end of the lending period.
Only Adobe® eBooks may be returned early.
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So blame it on the lawyers.
Actually, however, the Overdrive app for iOS (recently updated to read ePub/PDF) does not have a 'return early' function. The conspiracy theorists may be onto something...
I use Bluefire instead; it does allow early return.