You're not letting the buttons stop scrolling to the top before you press them. Look at the button when it doesn't launch on the first tap, it will be darker, like you're still tapping it.
The button is sliding out from under your finger and just reporting the last known state.
Its no different with the default springboard, the only difference is you can't press those buttons as theyre populating the page like you can with summerboard.
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