You might start by forcing an update to your cPanel installation. Next try clearing your browser cache and/or try another browser. If those are of no help, they should be, next stop might be that Support menu, top right corner of any page in WHM. On it, a link to Contact cPanel.
@Kabiru Can you please indicate us if the problem is with a cPanel or a N0C account?
Either way you may also contact our support team directly by ticket from the My Support section of your PlanetHoster's client area and our team will be more than glad to take a look at the problem together.