Problem creating route in Mapsource

Just getting started trying to use open street maps on my Edge 705. I’ve gotten as far as downloading the maps and getting them into Mapsource. Next I’m trying to create a course in Mapsource and find that there are grey lines on the map that the automatic routing doesn’t want to cross. I’ll be creating the route by clicking on roads, click on a continuation of the road on the other side of the grey line, and the route takes a huge detour and comes around to that point the other way around. I can’t get the route to cross that line on the road I want it to. They grey line doesn’t correspond to the edge of a tile, and it is not continuous. What’s going on and is there a way to fix this?