Where do you see that "new blank record"?
I would guess that it's a row in a portal.
If you have enabled "allow creation of records via this relationship" for the portal, then an extra blank row automatically appears in the portal. This is there as a place to create new related records by entering data into one of the fields in this blank portal row.
You can make this row disappear by clearing that "allow creation.." check box, but then you have to use a button/script to create new records in your portal instead of just entering data into the "add row" of the portal.
I'm new to the filemaker format, but I'm guessing from the previous answer that the placeholder that is being created for the related portal record won't actually be written into the file unless you enter data into it. This would be in keeping with the need to write a foreign key into the related table.
Try creating a record on the main table then after commiting it open yup the related table to see if you have a blank record with the foreign key field populated or no blank records
Turns out I had one of my layouts set up wrong. I had it associated to the other table, which was causing a lot of duplicated entries and blank fields. Thanks for your feedback guys.