Currently there is an error, yes.
The information displayed when hovering the mouse over this tool and which lists the main dungeons carried out, has excluded those that have not been completed in time. This is just a display issue. The rewards will be awarded correctly on Tuesday, and you don’t need to complete the Mythic Keystone dungeon in time to count in progress.
This is a separate issue. There is typically a delay of a few minutes before the Great Chamber UI updates to reflect a recently completed Mythic Keystone dungeon. As we investigated this, we found that logging out of WoW and logging back in forces itself to update.
Source: BLIZZ
Learn all the details about the Great Chamber through our article (and how it works).
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