Hair not quite following the guide. This looks like what happens when transformations haven’t been applied to one of the objects.Translations should be compensated for in the addon but I don’t believe that rotation and scale are. You may need to apply transformations before generating hair.
2)HairNet only works with the guide hair so switching to interpolated mode is controlled by Blender itself. I don’t know what could be causing a change of direction there. Does reversing the direction of the curve object make a difference?