Playlist shows as incomplete

Hello and sorry for the not-so detailed title, but I have an issue which is most likely shared by many others, that, when completing playlists in co-op, the playlist menu option will say something like “9/10” or “11/12” (9/10 playlists, not missions).

This happened when I played a playlist with my younger brother, and upon finishing the playlist, I noticed the playlist menu said the playlist was incomplete, despite the actual playlist showing complete, and all levels with a blue bar. I have read elsewhere that some people had this issue in Halo CE and Halo 2, I had mine in Reach and my younger brother actually has the same issue in CE.

How I fix this please. I kid you not I just REPLAYED the legendary AND LASO campaign for Halo Reach and still the issue remains, but I did not click “restart playlist”, just started from lvl 1 and finished.

I should note that this is in the PC steam version.

Thank you and any help would be appreciated!

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big chungus