Hostname doesn't resolve to DNS server IP address

I have a home server connected to a router which set to use a DDNS with an integreated provider pointing to a no-ip DNS server. After a power outage my domain can't be reached any longer. Checking the IP address with dig +short pacolola.net ...I get the address 188.151.207.219. According to the router's Public IPv4 Address and No-IP's user pages it should be 188.151.218.129. Using the later address shows the page content and the server's internal IP address is also working. I've attempted to restart the network with sudo service networking restart and various DNS cache reset commands without success. How do I resolve the hostname to the IP address which the DNS servers are using? Is this a DNS problem laying with no-ip router or SLL or something on the server? What diagnostic tools are valid in this case?