If you can see more information on the website than in the app, updating the topo will usually fix the issue.
The same applies if a friend can see more details in a topo than you can — your app may simply be showing an older version.
How to update a topo in the app
Open the topo’s main view in the app.
Scroll down on the screen until the refresh option appears.
Tap “Refresh”
After this you’ll have the latest version of the topo.