TPS62913: Design generated by Webench not functioning when built on TI Pspice

Tool/software:

I am designing a power supply and I have used Webench to help me design a DC-DC converter from 3-17V to 1.8V @ 1.5A. The design on Webench seems to function on the online tool when simulating, but when building and simulating the circuit on TI Spice software, I am getting very different values as a result. I am not totally familiar with this software so I am wondering if I am making a mistake in the design of the converter in this software.