I agree with kaindub,
It looks like this settlement has gone through in hurry before Christmas and the 184 was not ready or not obtained before settlement.
In this case the op will have to get their conveyancer to chase the vendor for any adjustments based on the 184. Vendors solicitor should have no issues with that.
On the other hand, if the 184 is wrong then the strata manager will have remove the overdue fees.
What a mess!