one of our event had 10 pending payment registrations two days ago. During last two days we applied payment for 3 of these registration so they changed to approved. However in the meantime 1 registration changed automatically without our input to cancelled and 1 registration changed to waiting list. We have waiting list plugin, but Wait List Spaces are set to 0 for this event. There are not sent messages recorded.
Is there any way how to track it? How could that happen?
The registration changed to wait list will happen if the event is sold out at the time, and at that moment they visit the page to make a payment. Since the event is sold out, even if it’s a temporary sell-out due to reserved tickets for registrations-in-progress, their registration’s status automatically changes to Wait List. This prevents overselling. Their registration status can be changed back if the event is not sold out.
With regards to the cancelled registration, that will happen if the registration was moved to another ticket or event when using the Attendee Mover add-on.