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Thanks for making us aware. We think that our community platform uses some app cache for page that are loaded with content but are a bit static while the hover card uses direct API calls without caching them. Let me know if you are still seeing the issue and we can check with them.
On my screen at least, it looks like there is still an issue, although it is smaller than it was earlier today.
I now see 89 solutions on the leaderboard, and 90 when I hover. I have not had any new solutions marked in the past few hours (to my knowledge). Overall, the discrepancy has gone down today, but it still exists for several users.