Form displays differently in IE8, Firefox and phone

The problem with IE8 is that your theme sets blanket background/border properties for all inputs.

[css]
.gform_wrapper input,
.gform_wrapper textarea,
.gform_wrapper select {
    background: none repeat scroll 0 0 #F7F7F7 !important;
    border: 1px solid #DDDDDD;
    color: #0088B3 !important;
    font-family: Arial,Tahoma,Verdana !important;
    font-size: 12px !important;
    padding: 4px 0 4px 5px !important;
}

That's the lazy way of doing it. Not all inputs are created equal. Since radio buttons, checkboxes, image buttons and buttons are all input types too, they're naturally going to inherit from that rule.

You'll need to adjust your rule to remove those properties, or apply them to the specific input types rather than just the blanket input element. Your theme provider should be able to provide you with some guidance on this.

I don't have an android phone/device so I can't test that right now, but we haven't had any other similar issues reported so I would venture a guess that issue is related to your theme as well.