I have had 2 boats documented in TX. neither one has a Texas Title.
If you have both, it is in error on the state's part.
Did you have the Title First, then get Documented and have a copy of your original Title? If so, the Title is not valid.
Are you sure that you are not getting "Registered" confused with "Title"?
Cruising the Eastern U.S. Inland Waterways
Presently on the Tennessee River - Joe Wheeler State Park - Rogersville, Al.