CONSPAN Shear and Moment Envelope E-80

I am having an issue with CONSPAN calculating the shear and moment envelopes. I am designing a 75 ft beam using the AREMA Cooper E-80 Live load. The shear and moment envelopes that I get are not symmetrical.

The live load shear row (highlighted), and the live load moment row above it are not symmetrical. The midspan shear is 29.9k, and the 0.4L and 0.6L shear values are 80.5 and 34.3 kips, respectively. If you run the load across the bridge both ways, the envelopes should be symmetrical.

After messing around with some things, I found that the trigger of this problem is span length.

As you can see from the picture below, for a 60 ft span, the shear and moment envelopes work like they should.

Does anyone have any clue why this problem is occurring, and if there is any way to fix it?

Thank you.