How does rakuten credit card payment work?

I got my card at the beginning of this month and have spent around 17k yen since, I am assuming that would be the amount I will be billed for on the 27th of May but the billing amount for May is showing up as only 4700 yen on both the app and website. Whats the deal with this, are they just super slow with updating the billing amount because the latest date in the statement was a purchase I made on April 13th or is this just how their billing cycle work and the rest of the 17k yen will be billed in June instead?

by MajorInitiative6425