Not an Issue Chinese symbols in oxide .data files

I reinstalled oxides because of too many server attacks. I removed all old oxide files. Now I see the following content during reinstallation, in the oxide-data-folder, in the file "oxide.group.data": See attachment. It does not matter how many times I delete, replace or reinstall it. It always looks the same. If I take old entries from an old backup and copy over these Chinese characters, there will be a large list of error messages at the server startup and the file will look like described again. Is that wanted? A joke? Or did someone live on my home server? Sorry, but I'm not so well versed that I can classify that and need the advice of someone who knows better whether that's normal or not.
Thanks in advance.

 

Thank you for your prompt reply! I think, will reinstall my complete Windows and make my server completely new. That will be the best. I really have everything on plugins, which I think is important, SteamChecks, CommandBlock, Password, Whitelist, VPNBlock, CountryBlock (it's a purely private server) but it does not use anything. There are always some hackers in the release lists. It's not fun anymore. Thanks again, even if it does not help me much.