All Platforms Konstru is working with are orienting slanted columns towards their inclination angle. This means a cross section rotation of 0 degrees results in a profile orienting towards inclination. like this:
In Grasshopper you can force slanted columns to orient towards one direction if necessary. This affects vertical beams as well (see image below) where rotations are kept at one specific angle except when beams are vertical. Please keep this behavior in mind when translating models across platforms.