If you go to the database and mark them as text, then update the server behavior they will be marked as text by eCart.
eCart marks them as they are defined in the database at the time it is run. It appears you have a UserID field which is set to a number in the database and as a number by ecart. I think you have to update the database and make it text and then reapply the Store cart summary in database server behavior after marking the field as text there.