I need help with aggressive mob!

Hello everyone! I'm new to the Minecraft modding community and I need help creating my own aggressive mob.
The thing is that I created a mob that should quickly catch up with the player and kill him, and it seems to me that I have set up enough speed for him, but when the mob sees the player, he simply cannot catch up with him, he can stand in one place or just spin around himself, and it is easy to get away from him without even running. 
I will attach all the AI ​​settings of this mob and will try to attach a video where this problem will be shown. Is this a Minecraft or Mcreator bug or did I do something wrong? I need your help.

And this is wideo with problem https://www.youtube.com/watch?v=wH8-29L9rb8