Listen to the end of the bridge where there is a crescendo into the outro. In some of the tracks that crescendo simply ceases to exist. It's a major part of what makes the track dynamic. It adds excitement but somehow in some of these "masters" that has been sucked out. All the life, the thwack of the snare is crushed into oblivion.
I'm looking forward to the results. Bring it on. If I had to guess, 2 was mastered by a seasoned engineer. 4 is either also an engineer or a very low setting in LANDR. The mix is less balanced but still dynamic. 1,3,5 & 6 I would pin on LANDR but they've told us that there are humans involved for at least 4 of these.