I experienced the same issue. Here is the bug report I submitted on 10/15/2015:
"I believe I've found a bug. It has to do with vertically scrolling the list that contains individual events for a specific delivery.
When I select a specific delivery within the list on the main page, it takes me to a second page just for that delivery. On that page, there is a header at the top containing information such as the tracking ID, estimated delivery date, carrier, etc. This header is collapsible. Beneath the header is a list of individual events. The list can have several tabs (All, #1, #2, etc) or have no tabs.
I have noticed that vertical scrolling for this list is only enabled if the list is longer than the device's screen height while the header is collapsed. The result is that the full list can be seen when the header is collapsed but when the header is expanded, part of the list is cut off and the user cannot scroll down to see the rest of it.
I hope my deception is understandable. Please let me know if you have any additional questions. I have an LG G2 running Android 4.4.2.
Thanks."