Why is this a kicked ball violation

Lowlight KD saunters up to midcourt and a 8-second violation is called

KAT attempts to save the ball but it is ruled out of bounds upheld on review

Can someone explain to my why this isnt an offensive foul on Jaylen Brown

Kevin Durant sees a double team and runs backward into a backcourt violation

Precious Achiuwa scores gets called for the travel which he does he disagrees with Then in the next possession he dunks stares at the ref and gives him the traveling violation sign

Cade Cunningham blocks Keldon Johnson from behind and the Spurs fail to inbound the ball - 5 second violation with a replay