every time I make an edit to the config, it stores it as "config_old"
and creates a new one to overlap the one that I edited...
How do I solve this issue?

Hey! That doesn't sound right. Can you post the an example config that gets overwritten every time? And the version of ServerlistMOTD.

Ohhh sorry for the late reply,
I’ll send it in the morning?
I stopped my server and it takes a llonnnnnggg time to start xD

Well, this isn’t very helpful. I need to see what’s inside the config.yml and config_old.yml. Just copy and paste the content of those files here https://pastebin.com/ and post the link here. :)

oops haha its upside down

I'm not so sure about the version tbh

it was the lastest one on that day

Hey, super sorry for my late response. A lot of stuff is going on lately.

Turns out you didn't escape the ' in "caiju's". You only have to change it to "caiju''s" and it's going to work. You can also copy the config from this paste: https://pastebin.com/8BsyP2jg

I hope this helped!