I just noticed this too - the Ded Home Mort worksheet is incorrect. It does not match the IRS Pub 936 version. It excludes any interest that is not reported on a 1098.
Per IRS Instructions (Pub 936) -
Line 13
If you make payments to a financial institution, or to a person whose business is making loans, you should get Form 1098 or a similar statement from the lender. This form will show the amount of interest to enter on line 13. Also include on this line any other interest payments made on debts secured by a qualified home for which you didn't receive a Form 1098. Don't include points or mortgage insurance premiums on this line.
