Solid Surface offset direction discrepancy

Hey internet,

I’m trying to add straight portions on the ends of these sweeps, and I like the result on the right, but not on the left-- as the straight portion goes in the opposite direction, into the part. I thought it may be something to do with the direction of the trimmed surfaces, but they appear to have the same direction. Any help would be great!

Thank you kindly!

difficult to say without having a file to check
you can try a [deconstruct brep + brep join] and apply the extrude to these newly re-joined breps to see if the result changes