I had been watching you for long time, keeping continuous track on your vehicle HP. You were being chased by officer Peter.Williams in Mulholland, Los Santos. Your vehicle lost HP only at some moments. Your vehicle was rammed, shot and melee attacked multiple times, though it only lost HP at some times. It didn't lose HP when it should have lost according to the game physics.
First of all, do you have any mods installed, that change your game?