The BDRX-Chattahoochee takes a route that uses Fowler Road. Kurviger does not recognize the road and will not allow the route to go down Fowler Road. The coordinates for the two points that won’t connect are:
34.678905, -84.307172
34.678156, -84.308755
Both colored parts (orange/purple) of Fowler Road are in OSM declared as “private” - therefore Kurviger doesn’t route there.
But: “private” doesn’t make any sence for the “orange” part because Fowler Road is connected to several other roads, in opposite to the “purple” part. So it’s IMHO wrong defined. If you drove it sometimes you may correct it.
To solve your problem today I recommend to use the beeline option - see https://kurv.gr/m4sHf
