Link LUTs by name and not index value
Adobe Premiere remembers the LUTs selected on a clip by an index value rather than a name value. If any additions or subtractions happen in the Lumetri LUT folder, all existing projects will now have the wrong LUT selected as the list has literally just shifted up.
Super annoying to have to essentially re-grade entire projects due to adding a LUT to the lumetri lut folder.
Kevin Monahan commented
Are your LUTs wrongly installed in the app package? Sounds like it. Please install them according to Adobe documentation to start.
Please don't follow install instructions from a five year old internet article. Installation instructions have changed. Installing LUTs in the app package is a recipe for disaster.