One day I opened up minecraft and randomly there was a light level number on all the blocks (although my brother might have accidently done it) and I cant remove it. I even uninstalled mini hud and mali lib, then reinstalled them and it was still there. Also I had turned on the light level for the info at the top left but i used that for days and it didnt happen until yesterday so Idk. I also reset all the settings. Please help its getting annoying.

Attach a screenshot?

Sounds like you have just enabled the Light Level Overlay. Use the hotkey from the Renderer Hotkeys category to turn it off again.

I'm assuming this was solved.