Bought two sets for my kitchen wall. Installed the first with a beautiful solid cherry wood shelf. The brackets were attached to the studs and everything was securely fastened on the install side. But the shelf was resilient and flexible when tested with light weight. Jumping means that when you pick up something like a plate or cup of it, the shelf visibly jumps a bit. They just aren't strong enough for the weight they claim to be, and they flex when you add weight.
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