Hostname changes on every reboot

Hostname changes on every reboot I want the hostname to be "server1.domain.com" it changes like it should but when I reboot it goes back to "server1" I dont have a clue what to do I type in hostname it responds with "server1" and then hostname -f "server1.domain.com" that does not change even after reboot I am bit new to this...

Are you using AWS ec2 or Google cloud?

I am using a VPS from vpscheap.net

Kindly change the hostname through Change Hostname option in CWP admin panel.

I did but when it reboots or updating it reset back to "server1"

there are couple of places to specify the hostname. You may run a meta search for that string in question and see where it pops up and adjust accordingly.

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grep --exclude-dir={boot,dev,media,mnt,proc,run,sys,root} -rnw '/' -e "server1"

Million things popped up dont know what to do with it really sorry

more refined search, yielding less results. it may take a few minutes to complete the searcch

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grep --exclude-dir={boot,dev,media,mnt,proc,run,sys,root,var,postfix,dovecot,lvm} -rnw '/' -e "server1"

The most likely places where the hostname is stipulated are

/etc/hosts
/etc/hostname

for some reason now all my pages are "HTTP Test Page" so everything is kinda broken and dont know what to do about it

Ok I sorted out the http test I accidentally changed the shared IP

But still sorting out host name 

/etc/hosts
This does not change until I update the hostname from the web interface

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127.0.0.1 localhost.localdomain localhost
# Auto-generated hostname. Please do not remove this comment.
123.123.123.123 server1.domain.com  server1
::1 localhost
/etc/hostname
This does change when I update or restart
that is what I change it to

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server1.domain.comafter reboot

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server1

Just want to add one thing its not the vps settings that is set to "server1.domain.com"

I am thinking I am getting confused between fqdn and hostnames but still not sure how to sort it out

I did some research on this problem and I have sort it out by locking the hostname file and I just did hosts aswell just incase I think its the hosting provider that did this but here i used this code.

To lock

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chattr +i /etc/hosts /etc/hostname
To unlock

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chattr -i /etc/hosts /etc/hostname
If there is a problem with this to cwp please some one let me know thank you