First of all - thanks for all the reivewing work do do!
And yeah, there is something a bit strange about that. At least the number "reviews all-time" is for sure off.
As on the following screenshot - it says there were 202 reviews of first question in all-time. Which is obviously a bs, both you and myself have more than that (we both have the silver badge for 250 review tasks). But then I am quite puzzled how can I have 27/250 progress on "Reviewer" badge as I have it already.
One thing I have noticed before with upvoting badges is that once you get the silver badge, it restarts the count for the gold badge, so to get the gold badge you need 910 vote counts, not 600. I think the same is with reviewing, so to whatever your badge progress is, you got to add 251.
You got the Reviewer badge for this category on Mar 23 2020, assuming a constant rate of queue processing you should have a few hundred review tasks done by now :-).
Would you like me to ask on the moderator forum?