Mostly, This happens due to Caching and Browser Caching due to which Browser is not Updated with the New Content or New IP Address.
For Updating Browser Pages: Clear Browser Cache and Cookies
For Nameservers Updation: (Please wait 24 hours before proceeding with this step)Please download CCLeaner : https://www.piriform.com/ccleaner/download
Install CCleaner and perform an Clean action on all your browsers.
After cleaning with CCleaner Open your browser > History > Clear all browsing history from beggining
