Originally Posted by hailstorm

Then you must not have made this reservation online, as it will not allow such a reservation for 4 adults (e.g. person over 13) and 1 child (e.g. person under 13). Would you care to share how you made this reservation?

Edit: Ah, I see it in your original post, though I'm still not sure what "MHC" means. Hopefully they are aware that the age of adults in Asia (13+) is different from the age of adults in other regions like NA (18+).

Originally Posted by invalyd

Looks like OP (incorrectly) indicated 3 adults and 2 children based on above screenshot

Originally Posted by hailstorm

The fourth "adult" could be a child between the ages of 13 and 17 (adult in Asia, child in NA), which would still register as a child in the system.