Describe the bug
Some subpages on the Submitty website either lack or fail to display a mobile-friendly interface, even when loaded on mobile devices. For example, the discussion forum page, as shown here via the Firefox Devtools, has a sidebar on the left and a much larger user interface indicating it is the desktop version of the page:

Expected behavior
All subpages, when loaded on a mobile device, should display the mobile-friendly interface, such as the Gradables page shown below:

To Reproduce
Steps to reproduce the behavior:

1. Open up the discussion forum page in Submitty.
2. If on a desktop, use the browsers developer tools to display the page in the mobile format.
3. See the large UI and menu bar, indicating a desktop UI was loaded, not a mobile-friendly UI.

Configuration

• OS: Arch Linux and IOS 17.6
• Browser: Firefox

Screenshots
Screenshots included above.

Additional context
Sometimes the behavior also depends on the page rotation. For example, the profile page displays mobile-friendly in portrait mode but the desktop page landscape mode, when tested on an iPhone SE 2nd generation.