best way is to sandwich the vertical post in between the beams Spence and use some 1/2" galvanized bolts through the whole thing. Will never twist like that and the supports can be done that way too with a bolt through the whole thing at the bottom. The way you have it you will always have problems-good that all the downward force is on top of the posts but bad because it can rock either way. The weak point in the whole deck is if that beam slips sideways like it's going right now. Did you ask the local building inspector what he thought?
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