If that's a side effect of reverting the votes of systematic downvoters, fine, but if we now have a systematic upvoter, I really don't want to see this.
Given that we just got a new moderator, it might very well be that someone wants to test out the response about what happens when he goes and votes up systematically.
I personally also got similar jumps in my karma.
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. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.