Plugin did not vanished after deleting

Hello, I installed some health indicator plugin on my server, then unistalled it, but indicators are still here on old mobs, if new mob spawns it don't have indicator, it really sucks becouse mobs are bugged with it, and when i kill it, indicator is still here, how can i delete rest of plugin? thanks for replies

It didn't work for me, i tried that, but it's same

I applied backup and its normal, but thanks to all of you for replies