port forwarding not working

in the xfinity app i have set ports for 7777 and 27015 TCP/UDP, but when I use port checkers such as portchecker.co or canyouseeme.org it says they are not open, even when I try to use telnet in Windows cmd it doesn't show that these ports are active

-i have already opened the ports on firewall

-I have already restarted my router, PC, and the server I'm trying to get these ports to work for

-completely deactivated windows antivirus and firewall as a last ditch attempt
-and several other minor tweaks I could find 

yet nothing has worked 

some other info you might need is:
-my PC is connected via ethernet
-the server is for a game called ARK: Survival Evolved

-the server worked fine for the past 3 days, suddenly stopped

-and yes, the server was on when I try to verify that the ports were open