Could someone help me please.
I'm developing a webapp with jquery mobile (1.2) and everything looks okay in portrait mode (iphone/ipad) also page transitions.
But when I turn to landscape, just before the page transition from one to the other the font size gets bigger and the view resizes.
Try adding "initial-scale=1" in the viewport meta tag.
<meta name="viewport" content="width=device-width,initial-scale=1">
I had exact the same issue and it solved my case.