I installed the dps/tank luckyone UI and whenever i load in to anything in game my chat disappears and i have to use the set up chat button in the elvui menu.

If anyone else is encountering this, you have to create a default UI Edit Mode profile, move the chat close or inside the ElvUI chatbox and save the Edit Mode profile. Then ElvUI can properly snap and handle your chat tabs and they won't keep disappearing after loading screens.