Hi faststache,
Any reason not to contact your lender and ask for more info?
If you're incredibly bored, the TIL timing requirements are available in regulatory gibberish at "Reg Z" Sect 226.18 and 226.19 (making a couple assumptions about the nature of your loan with that citation).
Some lenders take a "100% cure" approach to disclosure mistakes that carry potential liability... or are kindly directed to take that approach by their friendly neighborhood regulator.
Like I wrote, why not ask the maker of the check?