1) please use the same version of library and skins. And highly recommend to try 3.3.3.Final as much IE8 related problems were fixed since 3.3.1
2) if jnot helps please show which meta's you added to head section.
Thanks Ilya, actually i discovered that there is a "display intranet sites in Compatibility View" setting in Compatibility Settings View, when i uncheck that setting, it worked! , i noted your recommendation as we have new projects upcoming.