Nevermind! It was my mistake and not actually a bug. I apologize and thanks for the help.

that's the number of people who've joined your group?

It's definitely the number of members your group has, underneath the number it says members. Your UN is just long enough that there's no space between them

LOL omg I feel foolish now. I swear it said 0 at one point, but maybe it was 10 and my username cut off the 1. Thank you both!