There's a moment in Cory Doctorow's The Reverse Centaur's Guide To Life After AI where he quotes Mark Fisher's definition of eeriness (from The Weird and the Eerie) as "when there is something present where there should be nothing, or is [sic] there is nothing present when there should be something." It's a great description of why so much AI art in particular just feels wrong, even if you can't put your finger on it.