my old hostname is still active????

I have no idea what’s going on. my server once run fedora, and its hostname was fedoraserver. I recently installed AlmaLinux, and now its hostname is tserver. today I was looking at the logs of jellyfin and… Slow HTTP Response from http://fedoraserver:8096
…
…
…

• realization *
  …
  WTF!!! It’s like I saw a ghost. do any of you know what’s going on?

even more strange:

<span style="color:#323232;">$ host fedoraserver                                                                                                                                                                                    
</span><span style="color:#323232;">fedoraserver.station has address 192.168.1.4
</span><span style="color:#323232;">fedoraserver.station has address 192.168.1.13
</span><span style="color:#323232;">fedoraserver.station has address 192.168.1.41
</span><span style="color:#323232;">fedoraserver.station has address 192.168.1.10
</span><span style="color:#323232;">$ host tserver                                                                                                                                                                                         
</span><span style="color:#323232;">tserver.station has address 192.168.1.13
</span><span style="color:#323232;">$ host 192.168.1.13                                                                                                                                                                                    
</span><span style="color:#323232;">13.1.168.192.in-addr.arpa domain name pointer fedoraserver.station.
</span>

I’m… I’m scared