I'm getting this issue where when I do /pex user (name) it pulls up things like this when the player has a different rank and extra perms. This has happened a few times now.

Version 1.12 - going to 1.12.1 soon

Unfortunately PermissionsEx is currently unmaintained and no further updates are planned. Because of this, all pull requests are being closed. If you are looking for an actively maintained permissions plugin, take a look at LuckPerms. It is compatible with major server platforms and can import data from PEX.

The mcuuid.net website is showing the correct information for my name. (And for my step-daughter's account's username.) It's showing the same UUID for me that I've had since UUIDs were first included in Minecraft.

Is "KnowledgeIzPower" your legally purchased Minecraft client username?

Ok, let's start at the top.

What version of Minecraft is this happening in?

Which version of PermissionsEx are you using?

What server wrapper are you using? (Spigot, the Mojang client, PaperSpigot, Craftbukkit, something else?)

Copy your entire permissions.yml file to Pastebin for me.

Copy your server log to Pastebin for me. (A 2nd link, not included in the above paste.)

Copy your server.properties file to Pastebin for me. (A 3rd link.)

If your server is in offline mode, even if you are signing in with a real account all your UUIDs will be offline mode UUIDs -- that could be your problem here.

Have you resolved this issue, @Metisuneatn ?