all of this is because of their bug use.....
Since baam won 2-0 against gxr, baam has 5 points, and gxr still with 2 points. BAAM is guaranteed to qualify for the playoff while boom and x10 are tied with 3 points. To decide between boom and x10, according to liquidpedia they calculate it by head-to-head round of their match today with boom leading by 1. thus boom becoming the second team to qualify in group C. hope my explanations will clear out your confusion
https://clips.twitch.tv/SplendidEmpathicDelicataAMPEnergy-wIo761yjSSqU4kAO
here's the clip for the cam if you want to see it for yourself