I don't care about the reputation points. I'm wondering, "What was that?"
If it's an "adjustment" for something I did wrong, I'd like to know so I don't do it again.
This is nothing to do with you personally.
It looks like yesterday one person went through some your questions and answers and gave you upvotes totalling 120 reputation points. This is considered by the system to be a form of (potential) voting fraud. I'm not sure if the limits have been made public but whatever they are the votes you received triggered the vote fraud script to reverse the votes from that person.
If you get voted up for more than 40 rep I think within a certain time period by one person, you will get this revoked as it might be considered fraud (had this as well here)