I wonder if you're seeing a different map?
The map I see only has one route. 7 hours and 7 minutes, 385 miles.
Here is a screenshot of the route I see in my link.
View attachment 72388
Looks like good route, this is what comes up on my tablet when hitting your link. It looks it’s picking up your route from stl to Lebanon than changing it to fastest route which must be some default setting on my tablet. Gets to the usual choices all interstate, no interstate, some interstate than the Nashville or not choice.
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