I read in a number of LC's public docs that service fees vary by investment channel. From one of the recent 10-Qs:
"Note investors generally pay us a servicing fee equal to 1% of payment amounts received from the borrower. Whole loan purchasers pay a monthly servicing fee of up to 1.3% per annum of the month-end principal balance of loans serviced. Certificate holders do not pay a servicing fee, but pay a monthly management fee of up to 1.5% per annum of the month-end balance of assets under management."
I've been collecting data from the API, and the actual service fee rates (averages) look like this:

I'm puzzled about how this corresponds to the written policy. Fees on F look to be significantly lower than 1%, and W fees are even lower. Can someone explain?