chapter 1- questions

everyone seems to have forgotten buttercup's birthday! buttercup feels scammed to be honest. she thought she wouldn't care about something like this but she feels wronged. growing up she and her sisters had separated their birthdays, meaning blossom's would be in the first week and buttercup's in the second of may. bubbles was in the third week of may. however no one seems aware of buttercup's birthday it seems. what's actually going on?