Don't switch servers and it won't happen, stick to the same server.

In T160713#2234272, @Geez wrote:

Hello richkar1127.
If you select this specific character that is related to that specific server in main menu and press the Rename button to rename the character, do you still have the issue? Keep in mind that community servers use their own database for each specific character and that you have to rename the character that is tied to that specific server.
Regards,
Geez

You need to rename yourself in the Dayz launcher NOT in game. Almost all community servers discord general chats or support will tell you this. Many have an automatic bot response for people who ask.

If you have played less than 2 hours on steam and have owned the game for less than 2 weeks, you can easily request a refund from steams help which is an automated process.