Yeah the GLM UI showed the curves as different, but when I measured in REW, they were all(except 1) mostly the same. When you get time, I would try doing a MMM with REW and check. Below are my MMM results(hopefully labeled enough to tell you what each measurement is).
View attachment 105424
As you can see, the Manual -7 curve results in everything being shelved down 1dB or so below 2.5kHz(relative to the orange "GLM Off" curve). All of the other target curves measure oddly the same, and all result in the response above 1kHz or so being shelved up 1dB. Part of the reason I abandoned GLM was because I couldn't find a target curve that didn't either shelve the treble up or shelve the treble down, and as far as I can tell, there is no way to limit the correction to a certain frequency range(like you can with Audyssey or Dirac). I think the overall treble/mid/bass balance is perfect out of the box, so I don't want to change the actual spectral balance. I just want to smooth it out.
At the time(a couple weeks) ago, I chalked it up to me not understanding the purpose of groups, or some other user error. I'm still not sure that's not what it is, so I'm hesitant to submit a bug report. I'll probably check it out again this weekend and then reach out to Genelec if I see similar behavior.