Jquerymobile 1.3.1 rounded corners not displaying properly on blackberry 5 to 7

Jquerymobile 1.3.1 rounded corners not displaying properly on blackberry 5 to 7

With jquery mobile 1.3.0 and 1.3.1 rounded corners are not displaying properly on Blackberry 5 to 7. This is also evident with form elements, such as buttons, sliders etc.

Please look into this.