If you go to your reputation page in your profile and scroll all the way to the bottom, there should be a little checkbox labelled "show removed posts". Check that and you will see any posts that affected your reputation by virtue of their deletion.
In your case, the +1 is likely from an answer that you downvoted which was then subsequently deleted, either ...
Yes, that's how the reputation system works. Downvotes on questions are "free". Downvotes on answers will deduct one reputation from the person who cast the vote.
You can find this information in the Help Center article "What is reputation?"
You lose reputation when:
your question is voted down: −2
your answer is voted down: −2
you vote ...
The system basically detected a series of upvotes on your account within a very short timeframe all from a single user. This is not an assessment of your behavior, but rather the behavior of a "fan" that you may have acquired. Similar to targeting a specific user for serial downvoting, serial upvoting is reversed automatically by a script that runs about ...
The +100 rep association bonus is not counted in the protection algorithm. The post notice states (emphasis added):
To answer it, you must have earned at least 10 reputation on this site.
and the "on this site" part is actually quite literal, though not entirely clear. Therefore, looking at your rep history, you've got +100 for the association bonus and +...
5 points is the number of reputation points you receive when someone votes one of your questions up.
It's most likely that someone who had voted up one of your questions in the recent past has been banned or deleted, so their impact on the site has been automatically reversed.
See also: “User was removed” means I lose my hard-earned points?
It's actually sitting at +1 / -2, which gives you 1*10 + 2*-2 = 6 rep.
Negative net rep from posts is always removed when you delete them, and positive net rep is also removed if the post is below +3 or younger than 2 months.
This rule was added due to a discussion on Clever bounty reputation hack (on Meta SE) back in 2010.
So here's the hack:
Find an interesting question
Research and provide a very good answer
Open up a bounty on that question to attract attention and votes to your new answer
2 and 3 may be out of order--I didn't see the timing ...
One more argument in addition to eldarerathis' answer: Downvotes are not intended to punish the poster, but to cause him to improve his post. If he does, you can take back your downvote (and get your rep back).
If it was a real bad post, and receives enough downvotes (or attention from our mods/high-reppers [not "high rappers" :)]), the post gets deleted. ...
Tags and their structure are very site specific. A user should have some knowledge on how a site does organize its tags in order to create new one. That's one reason why you need 300 rep here and why it doesn't matter what position or how much rep you have on other sites.
Hitting the upvote rep cap is not necessary for a given day to count towards those badges, you simply have to earn >=200 rep by any means. Taken from MSO's "List of all badges with full descriptions":
silver; awarded once; same family as Mortarboard (bronze), Legendary (gold)
Earned more than 200 reputation on 50 days
On all meta sites except for MSO, reputation is synced hourly between your main account and your meta account. Since this doesn't happen instantaneously, there is sometimes a discrepancy between the two rep values in between syncs. The other result of this is that votes on meta don't affect your rep.
Badges are not shared between the two sites. You earn ...
Community will auto-award bounties 24 hours after their expiration under the following criteria:
Twenty-four hours after the end of the bounty period, if the bounty
starter has not manually awarded the bounty, an eligible answer can be
automatically awarded half the bounty amount. The criteria for an
answer to be eligible for automatic awarding are ...
You do not have the privilege to view deleted posts as of now, otherwise, you could have figured this out yourself. In the last 24 hours, you suffered a loss of 4 points in total, accrued from two suggested edits earlier. The two posts, both questions actually, have been deleted by Community user as part of deleting abandoned questions. Those two questions ...
As already explained in the comment section, this is a case of serial voting. To summarize it on your case,
Voting fraud is the systematic voting against correct voting rationales. Fraud most often happens with a single user continually voting (up or down) on many of your posts within a short period of time. This is not considered normal behavior and the ...
Here is the breakdown:
You had 1+5+2=8 points until an hour ago.
Then you received a downvote on a post of yours which took two points out of the total, ending up at 6 points.
Now, you pretty much had it all figured out, but you're missing the point stated in help center here:
Downvotes remove 2 reputation from the post owner.
The difference in rep-points is 15, which suggests someone might have accepted one of your answers before you checked first time (46), and decided otherwise during the same day (46-15=31). As that makes 15-15 on the same day, it's not shown as one action canceled out the other "immediately".
While Bryan Denny ♦ already cleared the mist here, I strictly recommend reading the question: Who are the diamond moderators, and what is their role?, and the very helpful answers there including this one which says:
Diamond moderators are human exception handlers. The main function of diamond moderators is to follow up on flagged posts but they also ...