The overall point is a complicated situation involving a downvote on a removed post, serial upvotes and their reversal. Normally, a downvote can be "made up" with additional upvotes beyond 20. However, this issue has arisen because the points were made up a serial upvoter (and then reversed) so there is no opportunity to "make them up". (I'm not sure if removing the downvoted post was important, but it made it harder to spot the problem.)
Here is more detail:
On Sep 6th (yesterday as I write this), I had a bunch of serial upvotes. Most of these occurred after I had hit the 200 point up-vote threshold for the day (so they did not affect points gathered). But, one was apparently worth +2 points, making up the points on a downvote from a removed post. Although the daily point total for yesterday reflects the +2 points, I don't think my total points reflected the +2.
On Sep 7th (today), the first thing that happened was a "Serial Upvoting Reversal" for the +2 points (so -2 points). Fine. That makes sense. The -2 points have been deducted from the total score. However, it doesn't seem that the +2 were ever really added in.
The net effect is that it looks like I've had a down vote (or 2 points deduction) when that hasn't occurred. Also, I can't make up these points by getting extra up votes beyond 20. Both today and yesterday there have been such "excess" points to make this up.
In any case, it seems that the reversal process is not perfect in this situation. Perhaps there is another step and tomorrow morning the reversal will be fixed.