Plugin Help Pex acting weird?

So, I set myself before in the Owner group. Then I wanted to test something by putting myself in a lower permission group called Player. I did what I need to check and now my prefix is stuck as Player...

I tried /reload and /pex reload, didn't help. Please help, cuz I don't like this "glitch" I guess.

 

@Lunartiq

1. Are you sure you didn't add the prefix to the owner group?
2. Is the prefix for owner in-game the same as set in the config?
3. What version is your server? If it's 1.12, PEX might not be stable? If so, you could create an issue for the developer to look into.

 

1.I did /pex group Owner prefix &4Owner, I did change the color of the Player prefix too.
2. The Owner prefix isn't showing up in game and it's &4Owner in config.
3. The server is 1.11.2 cuz it lags badly for me in 1.12 and my plugins haven't been updated to that.