Every time I'm in the creative zone, i have to press it the first time for the shutter to close, then once again for it to open. I change the apeture and ISO and it always happens. Sometimes it never opens the shutter.
Your camera could be enabled for Mirror Lock-Up, thus needing two presses of the shutter to shoot - first press to lock mirror up till vibration dissipates, second press to activate shutter.
In the menu, go to C.Fn III: Auto Focus/Drive, #7 - turn that off/disable.
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