I got about +30 as well, ad only a small amount is due to recent upvotes. And despite the jump, I'm out of the top 30-day contributors list, which I've been in and out of the bottom of for some weeks. The other names in that list are regulars there, so they must have got some upvotes also.
Perhaps some systematic downvoter had all his votes reversed?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.