Seriously loving my cellphone company right now.
PRERATE ALL THE THINGS
So, to whichever unfortunate person ends up with my support ticket for this, I wish you luck.
P.S. I was told there’s more context needed, so: look at the bundle type in the top bar, and then at the used/avaiable counts. What happened (my guess, but I’m pretty sure) is that when I bought it, their rating system preburned all the data I’ve already done this month (under previous rollover bundle).