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This is a well-known problem with iOS devices: they tend to override the defaults for all sorts of form elements, including buttons, checkboxes, radio buttons, etc. To fix this particular problem, try adding this custom CSS:
input[type="text"] {
-webkit-appearance: none;
}
That's worked for me. I'm putting together a highly hacked theme for Askbot for my site and this problem was vexing me.