I’m hoping this is a common problem and there is an easy fix. I have a fairly large platform on my laser 500mm x 300mm. The problem I’m having is for example if I place a project at x200 y200 the coordinates don’t match my laser platform lightburn may put it at x400 y 100, these numbers are just an example. I’d like to find a way for my display and platform to match.
What is this platform you speak of? What version of LightBurn? What OS, controller/firmware. You have not nearly provided enough information. This makes it hard for anyone to be helpful. 
Sorry, I’m using lightburn version 9.02, but had the same problem in 8.07. I’m using windows 10 , and the latest release of firmware( cohesion 3d controller) from cohesion. platform = laser deck.
Check to see you have the correct bed size defined in LightBurn ‘Device Settings’ and your firmware. They need to match.