My Hamster Has Decided To Only Go To The Bathroom In His Wheel?

It’s not one of those wheels that’s inside the cage; it’s connected to the cage by a little tube so it’s sort of like a different room from the cage.
This is annoying because some of the hamster piss gets on the TV tray his cage is on, and that smells bad. What is up with my hamster, and how do I change this behaviour?

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