I’ve actually seen this a few times, and it has to do with how things are stored in the database vs. displayed in the page.
The time the badge is granted is stored in the database in UTC, but the time shown on the badge page is based on your local time.
Most users won’t see an issue, but if the time difference is just enough from when you got the badge you’ll see this behavior.
On one of my instances it shows I earned the certified and licensed badges before the instance even existed because of this. 