Mortgage Principal

[Daniel H.]

Noticed that the principal portion of my mortgage payment went DOWN from Feb to Mar. Looked back over the last year and it kind of jumps around, not always continuously increasing. Called the bank, they said it was due to the days in the month. I believe they calculate 19th to 19th.

I checked my personal mortgage and the principal amount increases by a couple dollars every month like clockwork.

Does something seem funny about the first mortgage or do different banks calculate this differently?