There was a bit of a troll incident last night who downvoted a lot of posts, causing some temporary reputation loss. While it was handled (thanks mostly to @ArtOfCode), it'll take some recalculating to get all of the scores back to normal and the team simply hasn't had a chance to do that yet.
For the near future, the Codidact team is trying to figure out ways to prevent voting attacks from happening - there should be some updates coming on that within the next few days, I believe.
For the not-especially-near future, we're looking at removing the displayed points / reputation and replacing it with other metrics to show domain expertise and site expertise to work with the upcoming Trust Level system. This is, however, still a little while away from happening (and the specifics are still up in the air).