Scrolling sucks. Sorry, no better way to say it.
Most CWA pages are too large to display on a small device. When the CWA page contains a scrollable area, like a list of trips, and you try to scroll, the app doesn’t know whether you want to scroll to see more of the page or to see more trips in the list.
Tip: zoom out to show most or all of the list when you want to scroll the list and not the entire page.
See also: EBS scrolling.