I've seen a lot of people do this, but if someone gives an approval 1/2 and then next a moderator/character moderator posts a valid problem, then that 1/2 approval given just before is invalid. It's null. Someone will have to give another approval...
This is to stop certain people from not reading any comments and just 1/2 approving for the heck of it, which some people are doing and which is also why people are missing basic things like (Number)/10 MP...