Error when exporting to Excel

Good afternoon

We have a small problem with your add-on. We are using Ultimate member forms for user registration.

We have three mandatory fields for the user to register:

I accept the Privacy Policy

I confirm the registration

I confirm that I am a doctor

Your plugin exports the last two fields correctly. However, when we export the Privacy Policy field, it only appears for one user. It is empty for the rest of the users. This is very strange as the field is mandatory.

I attach a screenshot

Do you know what it could be? Thanks