Hey, sorry for the confusion. The rent you set is at year 0, and your rent increases each year according to "Annual Appreciation" (in reality this isn't quite what goes on!). The "net monthly earnings" in the output section tells you the numbers for the year you selected, so if you're looking 10 years down the line then the rent number will be significantly more than what you set it to be.
This is pretty opaque and we should have explained where the numbers were coming from. Had intended to add a tooltip there explaining this but looks like we forgot!
