From the questions on meta.SO (example), there are clearly problems with the /Review system and things are being changed all the time.
This answers says it's now 20 reviews per user per queue per day. I thought there was another question about close votes, but I can't find it now.
When they upped the daily votes to 40 (but with the caveat about question votes) things changed several times as the system was adjusted and it was really hard to find out what was happening as it happened. I think the changes happening with /Review will be just as confusing, so you either have to hang out on meta.SO or just
bend over and
take it as it comes. (Couldn't resist...)