While editing one of the submissions, I got an error like this.
Sorry you’ve run into this. Do you have many submissions and this one causes the error on edit? Was the original data collected with the Collect app or a web form?
If you could share your form definition that might give some hints as to what might be happening. Ideally we could also get the submission. Would it be possible for you to share by private message if we provide instructions on how? You could also message the form definition if it’s sensitive.