I have no idea if this is my brain that cant get my head to work it out or if daycare is wrong, so any advise would be gratefully received

DS has been in daycare for two days for nearly two years now. My DS9 also goes to afterschool care so I have/had two in care and our CCB for two kids is 96.7% there abouts For DS's two daycare days it worked out to be about was about $20 a week.

DS9 is on the waiting list for after school care this year so not included, but Lady P is starting this week for two days also. Two kids in care nothing else has changed the CCB is still 96.7% but my Gap is now $60 Huh? What am I missing here?

Their full fees are $67 per day for DS and $69 per day for DD. $272 full fee for the two days each - 96.7% of that is is $263 so how do they work out the Gap charge?
I know some centres have a minimum charge but can anyone tell me how they have come up with $60?? I rung them but I still didnt get it? She said that DS was $23 and DD was $37. And yes I know that at the end of the day $30 each is pretty minimal compared to some but I dont understand how it can increase so much??