If the still is loaded in a config with a Display LUT, it will show with the Display LUT just like a clip. So if the Still also has a LUT baked in, it will show a double LUT effect.
It's arguable whether this is logical or desirable.
Once a still is loaded, it doesn't refresh when you switch config tabs, so that's why it would stay double-LUTed after load. Conversely, if you load the Still in a tab WITHOUT a Display LUT, it will look the way you expect and that will also remain normal, even if you then switch tabs to the config with the Display LUT