Can the past change? It sounds incredible, but scientists are debating exactly this, with various theories ranging from quantum mechanics to the many-worlds interpretation. If it could, how would it appear to us? The internet is buzzing with wild ideas, so it's time to go over where they originated, and consider in detail what exactly might be causing it.
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I do not thing the Mandela Effect is the right term. Somehow dimension doors open or are somehow triggered by an event and if someone happens to be at the right place at the wrong moment in time we pass through that door into an alternate static dimension. We live and exist in the Dynamic and exact duplicates of us exist in the Static (other dimensions) and sometimes we change places because the static and dynamic cannot exist in the same place together.