SPC5 studio CAN IDs in the lower section of the ID table don't fire the interrupt.

[CDe S.1]

I'm using a SPC570S microcontroller and I have 14 CAN IDs in my ID table. Only up to 7 IDs fire the CAN interrupt, however, if I move a lower ID to above 7 it works fine. I have set the number of RX mailboxes to 16 and TX mailboxes to 7