Two users with a lot of reputation, e.g. StoneyB on hiatus and J.R. have gotten a drop of reputation near 2022 (first one 7,000, second one 2,000). Is this due a user being deleted, and the upvotes that that person had given to the user have been removed? Or offering a large amount of bounties (unlikely in my opinion).
You can only have 3 bounties simultaneously, for a maximum of 1,500 reputation. So that rules out bounties; you can also check the Offered bounties tab on a user's profile to verify.
Drops like that can be seen when a sockpuppet account or a voting ring is dismantled, but that's not the case here. It's very likely that this is a deleted user who cast a lot of votes. Luckily, both users have enough reputation that they do not need to worry about this too much.