@Mathtutor4  The most obvious explanation would be the type of payment, though with QBO, it's impossible to rule out the system simply malfunctioning.

At any rate, how did you enter the payments?

If the only payment by check or cash was the first one, there you go. Electronic payments do not go on a 1099-NEC, and electronic payments entered in any version of QB as such will not show up on the 1099-NEC, nor should they.