I have recently been playing with my new GPU and different HD / ENB mods. So I have several different Skyrim copies (all 1.6), most have my usual basic mods , plus Skyrim HD-2k v.1.5, and Vurt's flora. One has as well, an ENB, the Realistic lighting one, using the quality SSAO + Boked DOF. That one was classed as ultra-high by the launcher. I got done playing with config's for the day, and decided to give my standard game a run. It got (Why) re-detected as only high quality.

So, what determines that the settings need to be re-detected? And how are the settings determined?