Unfortunately, as amazing as Synty’s models are, they learned how many fingers were on the human hand by watching The Simpsons, and even then, they got it wrong… Only three fingers are articulated, but in many of Mixamo’s animations, all five fingers (don’t get pedantic, we know it’s four fingers, one thumb) are often animated. The animation for these extra fingers is discarded. If the important part of the animation was in a discared finger, it’s always going to look wrong close up.