saguaros
Yes.... like i said :
I do not know if it is the browser eating up the fields: connection brocken while sending, cache issue, or what ever but in the end the field value is gone also in the database (j25_dtregister_user_field_values)
I cant exactly say when this happens, and i cant really reproduce it....
Fact is that i have this customers with bad data! Fact is also that it is not so often because from 300 bookings its around 11.... My impression is that it has something to do with https://www.joomlart.com/forums/d/19736-conditional-hidden-fields-bug-in-recursion/5 and happens maybe when in the edit screen of a record not all conditinal fields are load and then get lost vile save the edited record....
Nether the less.... I think your aproche here is wrong! We are talking about a race condition not about something you can reproduce easy with 5 clicks. Thats why there should be a server-side / or even better database-side validation in place.... this is missed totally. So please put this on the to do for the next iteration!