The app does a great job of following a route, and rejoining it after a deviation. Sometimes a route will intersect itself (e.g. https://kurv.gr/3RzMv), and the only way to know which route to follow, when the paths diverge again, is to look at the arrow and distance at the top of the screen. Sorry, I don’t have a screen capture.
One way to make this clear on the map would be to un-focus the part of the route that is not current, either by blurring it or making it a lighter shade of blue. Another way would be to add arrows into and out of a convergence of the route for the current section.