This is a key question: Is SeasonNums::MeetNums a number field or some kind of calculation field? If a calculation what is it's calculation?
A relationship like this:
NumList::NumsBase = SeasonNums::MeetNums
will only work for your count function in NumList if SeasonNums::MeetNums is a stored, indexed field.
You sent me a private message confirming that the field is of type number. I'd normally reply there, but the new forum software release is glitching out and not letting me reply to private messages.
In that case, a calculation field defined in NumList as Count ( SeasonNums::MeetNums ) will return the correct count for you. You can actually use any field from SeasonNums as the parameter for the count function as long as the field is not blank for any of the matching records.