Hey @runnerpeach, 
Thanks for your post. We're going to send this over to our support team so they can check this out.
In the meantime, please try creating a route using a different browser to see if this is isolated to the browser you are using. 

Seems to be specific to my home starting location 

Hey @runnerpeach, 
Our support team has reached out via email requesting additional information to further investigate. Please respond to that support email or submit a new support ticket if this is still an issue.

If other are having an issue with route builder, please submit a support ticket and we will investigate further.