Since you mined 144 blocks in zero seconds, the retarget math didn’t just give you 4x it gave you 144x600÷elapsedtime which came out ~44k. Then the ±4x kicked back in on the next window.

It's averaged but the first blocks have nothing to baseline against. You also made it more aggressive going 2016 to 144.

tldr you gamed your own system and got punished.