[2020] Can some1 tell me why hjune is having 995 hp at 6:41 in his newest video

I've just checked this frame by frame because that would be an extremely abnormal bug.

I could not see any evidence of his heath going over 100 during 6:39 - 6:43. I believe what you're seeing is Youtube's video compression artefacts (example)

when watching at low quality settings.