I think this is a bug: I was updating some blu-ray profiles so filtered out my DVD profiles. I then flagged the profiles I'd done and used Flagged -> Contribute to submit them. The tickbox to "unflag after contribution" is ticked by default and I left it.
However after the contribution not only were the profiles unflagged but the filter had been removed as well.
Not exactly a program-breaking bug, but I thought I'd report it anyway.