According to a post on Andreas "MODDII" Fridh's Facebook page, fnatic will be re-playing the overtime versus NiP due to "misunderstandings in overtime rules".

fnatic had just scored a major upset as they took down the world's number one team 21-16 on de_train_se after a battle that saw them win comfortably 6-1 in overtime.

Now shortly after celebrating their group win, apparently the two sides will have to re-play the overtime due to admins allowing the match to take place with maxrounds five ruleset.

fnatic's upset win is taken away in Bucharest 

As DreamHack Bucharest rules state, the match should have taken place in maxrounds three, so the second half of overtime will be played from a 1-2 score, completely leaving out the final rounds.

Curiously this means the terrorist side rounds that fnatic won are completely discarded, even though they were able to take a 2-0 lead that would otherwise have clinched a 4-1 win for them.