How can I remove this character effect?

Hi i recently download a project to learn a few things and I realize that every time my character is running he makes a strange velocity effect on the walls so I want to delete that effect but I don’t know if its and editor option or something from character blueprint. Can you help or tell me what it is and if its not just and error?

Im using ue4.10.4

You can see what i mean in the video: