What the hell is that red group? I don't know even with the explanation. The Blue group is pretty weak as well.

The colour rows will always resolve into the same order, whichever order you solve your groups in, so when referring to a group it's better to take a fixed reference (e.g. cite a word) rather than "1st group" or "green group", which will vary each time :)

That orange group is a real fecker