Quote from Vinny1:
I usually pay my mortage a few months in advance, and then the bank immediately sends me a bill after I make a payment. For the second time in the last several months, they processed my mortgage payment incorrectly. Instead of applying it as a regular payment with some going to interest and some going to principal, they processed both payments as going to principal only,
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Viiny1, I will guess the bank is not knowing why someone make (advance) payment for no reasons. People pay advance for to save money on interest. So they see your advance payment (but you not telling them is for the principal?) so the processor (assume) you want to save money on interest. They apply your (extra)money to the principal.