I am reposting this with more information and more specific questions.

Form 1098-MA shows 20,416 both in Box 1 and Box 2; nothing in Box 3.

Form 1098 (Mortgage Interest Statement) shows 18,149 in Box 1 and
3000 in Box 4 (Mortgage Insurance Premiums). Property taxes paid: 5453. Ending escrow balance:
1837....