Hi @CTXBrabbs,
I ran the model with your data and my results are not all 0, but a lot of them are. For example, all the orange pixels in this image have a USLE value of 0.
This is happening because in your biophysical table, the P factor is 0 for most classes. Because USLE = R * K * LS * C * P, your USLE is 0 anywhere P is 0. Those 0’s propagate to the other outputs that depend on USLE.
A P value of 0 implies that no soil is lost at all, which is usually not realistic. I’m assuming you mean to indicate that there are no erosion control practices in those landcover classes. In that case, the correct P value is 1. Since it’s multiplied not added, P=1 has no effect on the USLE, representing a lack of support practices. I hope that helps!