Here is a short part of my normal route to/from Winchester
Travelling North-South the route is fine and exactly matches the situation on the ground. Now use the "reverse route" button. The route takes you on a hilly 3mile detour! In the real world there is no impediment in either direction, so I assume there is some wrongly-applied "one direction" message in OSM. It's really annoying because a lot of the many exercise rides we have ridden since lockdown go this way and I want to be able to choose freely which way round to plot. I have no experience of editing OSM and don't wish to make this error even worse by untutored meddling! Please help if you can.