Sure, but I doubt that this was the reason here.
No, you left the route shortly before WP17, to me it would make that Kurviger would reroute you to WP17. You skipped Waypoints 5-16. If you had done this intentionally you would complain that Kurviger is not rerouting you to WP17.
How would Kurviger know that? It can’t guess your intentions. The default behavior is to allow skipping parts of the route, which is awesome and extremely flexible. That’s the intended behavior, the other option is the strict routing where you have to visit every waypoint or even every part of the route.
Unless you configure Kurviger to that, that usually doesn’t happen. There are very few roundtrip scenarios where this can happen.
That’s what should happen. As noted previously, I can’t reproduce the behavior you describe, so I have no idea why it behaved that way.