Topples over when not in use

We love this unit when it is open. It glides easily over the carpet and is relatively sturdy. The gray color is handsome and blends into our decor perfectly. However, we don’t use it 24/7 and bought it so the top could be unhooked to hang down and the legs could be slid into the end of the couch so it could disappear when not in use. The problem? The unit won’t stay balanced and topples over. :( In the first photo I’ve enclosed, the unit won’t stay in that position without my foot holding it. If I take my foot off, photo two happens, which is loud and jarring and not at all helpful. It stores poorly in the fallen over position.......

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