By mistake I assigned the keys 1,2,3 and 4 to the Stances.
This made me lost the ability to form control groups since I can't rebind anything to the control groups.
Weirdly enough, only one control group is doable and its the "Group 6" that I can form by pressing "Ctrl" + "-".
I tried pressing the "Default" button in the Control option to fix the problem but it didn't rebind the numbers to the control groups.
It seems that pressing "Default" only affect the Controls that you can already change and leave the control group keys unaffected.
It's therefore impossible to use that feature (Control Groups) if you were to assign the number keys to something...