Hey folks!
Just having the Epik Name Servers won't be sufficient to get the SSL on your landers by default. You'd need to deploy the Premium Parking on the domains, which will issue the SSL for the landing page.
Can I confirm that is what's done here? So if you added NS3.EPIK.COM and NS4.EPIK.COM, you'd still have to select the domains in your Epik Dashboard and click Build -> Park This Domain -> Epik Premium Parking.
We're doing a check of the SSL status and investigating the new domains getting in the system, so we should have more information soon if this is a widespread problem.