Navigation Option Show "Original Route" Does Not Display Consistently

[Brian McG]

When I load some routes for navigation the display of the "original route" beneath the planned navigation route does not conform closely to the road, it appears to straight line between some unidentifiable points

On other routes it fits very close to the road & can only be seen to deviate a small bit when the navigation app is zoomed in to its maximum setting

All the routes are planned with MRA on the PC & then navigated offline with MRA Navigation.
Some routes may then be edited in the app

Could someone please explain why with some of my routes the display of the "original route" differs?

& while on the subject of the "original route" could the colour be changed from white to a much more contrasting colour?
on a bright sunny day with a washed out garmin map style selected the white "original route" is virtually impossible to see
(yes I know there are other map styles but occasionally for whatever reason my style reverts to the washed out bland garmin default colouring"