When I replace a LUT I get an undesired oil-slicked effect..any idea why?

Im working with a file that has a LUT plugged into the scene to create a colour-grade (this is what it looks like), but when i try and swap out the LUT for another one, the effects i get are horrible (they look like everything has been slicked with oil) and nothing like the LUT ive selected. I’m clearly doing something wrong, im just not sure what. Any ideas anyone?