Why is creator adding rows in a subform when it opens a form?

Why is creator adding rows in a subform when it opens a form?

Hi,

when I open up a form Zoho creator adds records to all the subforms, triggering all the add row scripts and giving me errors because they calculate off fields that haven't been entered yet.

Why is it doing this - I don't want rows already created. How do I stop it?

Thanks