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I'm not sure how much heat the buttons could take, but maybe too much heat during soldering? Mine took a good bit and they work fine, but I suppose it's still a possibility.
You're right; Maybe the left and right buttons are "stuck closed". Try disconnecting the left and right buttons from pins 3 and 5 and just trying the middle button (or disconnect all 3 buttons and manually ground pin 4, middle button pin).
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