As of yesterday, November 13th 2019, this is now in effect network wide:
We’re changing the reputation earned from getting a question upvote to ten points, making it equal to the reputation earned from an upvote to an answer.
An outline for wrap-up posts can be found at
Wrap-up posts: What should the formal part of it contain?
Please copy the outline’s header, being sure to include the words wrap-up, making and poser, so that wrap-ups are easier to find and distinguish from other kinds of posts.
Content below the header can be free-form and the outline includes many excellent ...
There was a recent widespread serial voting correction. (Perhaps there have been multiple waves. I am not privy to details.) See a main-meta report and more explanation. Likely, someone had a script which automatically upvoted 40 random posts in a day to get a badge. Since this is not allowed it was all reversed. You must've had one post that got swept up.
You also had an accepted answer on Riddle Me: What time is it? which was deleted for 65 reputation points. It shows on your Deleted Recent Answers list, but the date is the answer date, not the deletion date.
You also downvoted an answer recently for another -1, so:
2231 - 65 - 1 = 2165
According to this answer,
Month reputation is the amount by which your reputation changed that month, excluding "private" reputation events. Certain reputation events are excluded from your public user profile, such as deleted posts or downvotes,
This user seems to have (had) a high scoring answer, because they have a "Good Answer" badge for an ...
That's likely to be a suggested edit of yours, for which the removed user was the final approver. That is recorded as a vote, and most votes are deleted when a user is deleted, that's why you lose the 2 reputation. If you accept an answer, that's your vote, so it won't be deleted.
You can check which post the affected suggested edit was made on with a trick ...
It's by design. You will get the association bonus on all sites.
From the help center, What is reputation? How do I earn (and lose) it?
How do I earn reputation?
You gain reputation when:
site association bonus: +100 on each site (awarded a maximum of one time per site)
If you are an experienced Stack Exchange network user with 200 or more ...
If you are an experienced Stack Exchange network user with 200 or more reputation on at least one site, you will receive a starting +100 reputation bonus to get you past basic new user restrictions. This will happen automatically on all current Stack Exchange sites where you have an account, and on any other Stack Exchange sites at the time you log in.