The "problem" here is the fact that @Michael-Henson is a free user which can only use the OSM map.
Users who used the comparisson option (Gold Member) has seen that when comparing. The routelines of 2 maps are not identical. Also that routepoint which is placed correct on one map but at the wrong direction on the second map.
Advice for @Michael-Henson set you routepoint at such a position it cannot do wrong on different maps.
Not on crossings. Not on round-a-bouts Not on split lane roads. Not on roads where there is a parallel road beside it.Use as less as possible points. This works very good for one person but if you share the route with others who have their one device. This strategy could be a problem.
When you use this guidelines. It max. increases your change to get a proper route for your HD Boom.