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The width of custom select (data-native-menu="false") stretches to almost 100% of the screen and it's not taking into account the size of the content.
You can see the effect by observing custom select behavior here using ie9 or ie7: http://jquerymobile.com/demos/1.2.0/#/demos/1.2.0/docs/forms/selects/custom.html
Thanks for reporting the issue. I am closing this as duplicate of #4577.
I forgot to mention that we probably won't fix IE7 because it doesn't support display: inline-block;, but I will give it a look.