I just changed out a main panel in a residential home. The panel is a 200 amp main lug panel that I am feeding with A 100 amp breaker kit inside. I installed the 240 volt breaker and landed the conductors. I went back a week later to add a few more branch circuits. After I did that I tighten all my connections and move the wires to double-check. On that main breaker when I moved one of the conductors the whole breaker would move but when I moved the other conductor just the lug would move. Is this a bad breaker? It's new so it might be bad from factory.