In cases where your map displays a straight line between points on your trip (and you've already got the places set to "follow roads"), the first thing to check is whether you are connected to the internet - no internet connection may prevent road routes from being displayed. You can try rebooting your device or refreshing the cache to see if it is a connection or loading issue.
To try and find the exact sites which are causing issues, you can delete and re-add each of the places in your trip that have straight lines connecting them. If you choose to do this, start working from the bottom of your trip's place list. This might help the site route properly when you add it back in, otherwise, this process will help you identify which place(s) are the troublemakers.
If you find a specific place is giving you trouble, you can:
- Select the "Skip in Route" routing option for that place,
- Try moving the pin on your map slightly and see if that helps the routing service find the roads,
- Or, you can add a 'Waypoint' to help redirect it, see Can I make a Trip Planner choose a different road than the one selected.
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Article relates to Android, Apple, and Windows devices.