Hi. Has anyone had a problem with the "File is spam" message appearing when adding attachments?

This only happens when filling out a form added to a product in WooCommerce
(like here: https://bahamayellow.site/odprawy/produkt/oplata/).

When I embed the form on a regular page this problem disappears
(like here: https://bahamayellow.site/odprawy/osoba-fizyczna/).

Has anyone had a similar problem and know how to solve it?