just a curiosity, how is it possible to receive 5 points for an upvote to an answer to this question
There is daily reputation limit of 200 reputation points - meaning that it is not possible to get more than 200 reputation points in a single day from upvotes. (It is still possible to get more reputation points from accepted answers and bounties.)
In this specific case, you got to 195 reputation points (some upvotes on questions worth 5 points, some upvotes on answer worth 10 points) which meant the next upvote only added the amount missing to the daily cap of 200 points.
This is also explained in the help center:
You can earn a maximum of 200 reputation per day from the combination of upvotes, downvotes and suggested edits. But Bounty awards, accepted answers, and association bonuses are not subject to this daily reputation limit.
Meta Stack Exchange: What is the reasoning behind the reputation cap?