Check out how much rating did 3rd and 4th place on the round ended up having. 
The 3rd place initially had higher rating, and performed better on the round, yet he now has rating lower than the 4th place.
Is it a bug, or a feature that I don't understand?
Also cf-predictor(a chrome extension for seeing unofficial rating change predictions) shows the following rating changes: 
Sorry for bad image quality.
Auto comment: topic has been translated by ligaydima (original revision, translated revision, compare)
That's because of new rating calculation system for the first 6 contests. You can read here.