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A proxy doesn't match its original
Open the card for that pair: it says exactly which fact differs (frame rate, duration, timecode, audio channels, rotation, naming).
Most mismatches need a NEW proxy render with the matching settings — CHECK's Fix button only fixes pairs whose names or layout are the only problem.
A name-only problem (e.g. Resolve needs the base names to match) is fixed in one click with the Fix button — it builds a linked copy set and never re-encodes.