What parameters did you use? If you choose the fastest routing, the route looks pretty straightforward to me, see the screenshot below.
You can load the route here: https://kurv.gr/q2c6m
The route looks quite similar to Google Maps IMHO. I spotted a minor data issue around Neringa, which should solve an issue in that area as well.
BTW this could be also related to this topic: Show the route on the map
