Big bend sas mid vs black diamond mid only pricing. Need help.

So I’ve been messing the build and price tool lately and I find something quite odd. Maybe someone can help me figure it out. There’s a 4K difference between big bend mid sasquatch vs black diamond mid only, but the monthly payment between both is roughly a $5 difference given the same down payment making choosing one over the other difficult. A badlands std is roughly 43k-44k on par with the black diamond mid and way cheaper than a big bend sas yet monthly payments are $50+ maybe more.