I dont think those are bugs...the molotov has a certain blast radius. Don't turn your back and run, try and predict which way it's going to go and back peddle the opposite way while always keeping your eye on the enemy.
The One Hit also has a certain lock on radius, which is a good thing. Instead of running just shoot the enemy down. I never knew this, but last night I tried to One Hit somebody but they shot at me and each bullet made me flinch...and I died. I never that was possible but apparently so.
Edit: Thread moved from TLoU General Discussion