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Upgrading Cpanel version to newest one, Solved the problem.
thanks for your answers, i tried everything about browsers.
Thanks bro, but /scripts/upcp didn't worked. and there is no error or warning in log.
even i tried restarting whole the server after update.
its about a week that two of our Cpanel/WHM servers has got a UI problem.
the WHM web ui is really messed, and stopped our staff from...