How to truncate un-saved node fields

Hi guys,
i have a content type(team) with some fields(field1, field2, field3, ecc....).

For some reasons, sometimes, when a user clicks on the save button to create the node, the node is not saved but the fields in the database are compiled.

The address is created too, but when I click there is error, page not found.

I managed to find out in the Database what these fields are, but how can I do to truncate them ?

Thank you.