Hello
Just a small but irritating bug.
I put the Nick command on a 24 hour cooldown. Here is what happends.
If /nick is on cooldown, doing nick after about 10 minutes resets the timer, making you wait an extended period, not just 24 hours.

Is there a way to fix this?

I'm unable to reproduce this bug. When I type a command like /nick and then type it once again a few seconds after, I am told of the remaining cooldown and it is always consistent. The user file is also unchanged.

I don't believe this ever was a thing since it was implemented. But just to be sure, you can update your EssentialsX version from CI server here.