Why does Traverse in ArcGIS Pro behave differently it does in ArcMap?
First, entering a negative number for radius makes no sense mathematically.
The below screenshot shows the traverse commands from ArcMap on the left, then from ArcGIS Pro on the right hand side of the screen. The thin green line is produced from ArcMap which is correct. The thick dark green line is produced from ArcGIS Pro. The first curve is incorrect, that does not look like N 18-51-45 W at all, then the curve going south isn't correct either. The green lines are a feature class in a SDE Geodatabase.