Lots of blank submissions

Hi!

We are using Jotform in order to receive questions via our website su.se/ouralumni (the Q&A is linked to the photo pages of the representative alums) in a Q&A portion. It has happened now that the person who's email is linked directly to the form receives the question but that the submission in Jotform is blank. What could this be due to? Attached.

Best, 

Erica

Was that field with the missing data not set to required at some point or was it deleted and replaced with a new field?  If the field was deleted at some point and replaced with another field, the data associated with it would have been removed.  The validation appears to be working and when I cloned the form the data was being forwarded.