Some users running the Nougat (7) Android Operating System have recently contacted us regarding a bug affecting their timeline. Once a session is completed, the app will acknowledge this, return you to your timeline, and the next Session will unlock.
Almost immediately, the session that is released will then re-lock. As a workaround, you can re-play the session and Fast Forward, or complete sessions from a desktop computer.
Additionally, some users have found that deleting the apps cache and data via the 'Settings' of the device has provided a more consistent journey mitigating the bug.
If you are experiencing this on your device, feel free to reach out to firstname.lastname@example.org with the make, model, and operating system of your device to assist our engineering team identify and provide a fix.