pinching on select menu button prevent me from expand in iOS 5.1.1 safari

After I pinch on select menu button, iOS safari go on to prevent me from expand by pinch on every page.

After this issue began, I had to touch select menu button to open select menu, if so, I came back to be able to expand by pinch.

I confirmed this isuue in this select menu button : http://jquerymobile.com/demos/1.2.0/docs/forms/selects/

Is there any means to avoid this issue?

I don't want to touch select menu button, every time I pinch on select menu button.

Thanks.

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