I have a similar issue. I pull time into QBOs from Hourtimesheet and I can check the hours in QBO and they match. When I add those hours to a QBO invoice I can see the hours are correct and the bill rate is correct, but the bill rate times hours does not equal the total for each person on the invoice. It is off by only a few cents. It is like they are calculating each day first and rounding, then adding up each day or something. When I send it to a customer, they have a different system that just takes hours times the bill rate and gets the correct number. I have tried calling for help and they just say it is the fault of the external timekeeping. The hours are coming over correctly and that is easy to check. This will be what gets me to transition off QBO.