Missing Infopath Content Type in SharePoint Form Library

Question

I've had a strange issue come up. We have a Form Library in SharePoint with a number of InfoPath forms.

When a user creates a new InfoPath form using the "New" drop down menu and saves it back to the form library. The content type of the form and the document are not associated.

I can fix the document type, open the form back up, save the form back to the form library, and the content type is fine.

I can also in the same SharePoint site, provision a new Form Library with the same forms and content types and the problem does not persist.

Any ideas or thoughts would be greatly appreciated.