Hello! As per the Wiki "marking the stop position adds no information whatsoever when it is placed on the road at the point closest to highway=bus_stop. In that case it can be abandoned". The stop_position tag is designed for places where the stopping location is distinct from where passengers wait. On this route, the bus always stops in the same place as the bus stop and so stop_position is superfluous.

https://wiki.openstreetmap.org/wiki/Tag:public_transport%3Dstop_position