We have an issue and so far there is no solution. Issue: At the office and some customers happen to see the old webshop. The customers have never logged in or saw the Webshop. We have done: reindex, emptied cache. Moreover we can not use Filezilla and login to the FTP server from our office.
Happy to see some solutions.
As @muk_t stated, did you change your IP or switch server recently? If this is the case, it may take some time for DNS propagation to complete.
Besides that, you may also want to check if you have a host entry in your computer which is pointing the domain to a different server. If this is the case, only your computer will be seeing the domain which is resolving to the other server.
These issues occured from last august 2016 without any migration. Or these issues should be from november 2015 when we moved from Hosting Company. Anyway, the issues occure on several places / IP addresses in the country. As customers called us for support, they saw a completely other (read older) webshop. (Un)fortunalely we have the issue at the office as well in our office so we know we have to solve this issue before we start Google Adwords.
It sounds like your DNS records may not be configured correctly?
One other thing to check is to make sure that your www and non-www records are both pointing to the correct IP address?
Anyway to check the IP your domain is resolve to from multiple location, you can try using a tool like this: https://www.whatsmydns.net/