RSVPs canceling attendance by default?

HI there,
I was putting in our attendance list and taking money from Scout accounts for our camping trip this summer. The person I just put in says “No longer planning to attend.” We do not communicate via TT so this is weird. Also, it has listed a parent attending on the "coming’ sheet but when I go into the Members section on the planning page the adult is not listed under Adults section (or adults that are organizer or planning event). Any ideas how to get that child as attending? The adult thing isn’t a big issue as they aren’t paying any money.