I heard that, at the Quantum level, events can happen out of order making causality invalid. Thus the future can happen in the present and the present in the future. Is this true?
closed as unclear what you're asking by ACuriousMind♦, Diracology, user36790, CuriousOne, John Rennie Jul 6 '16 at 10:58
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In quantum field theory causality is preserved. See for example the answers to In QFT, why does a vanishing commutator ensure causality?. I'm afraid the subject is a bit technical, but I think it would be hard to give a popular science level explanation of how causality is preserved in QFT.
I don't know how causality is preserved in string theory, but the question Causality in String Theory asks this very question and the reply indicates that causality is preserved.
So it is not true that causality is invalidated at the quantum level.