UVRF 2.0 - framework that solves locomotion, grabs, world interaction, text and number inputs

I have used the UVRF template in a project using UE 4.22. As it can be seen in the attached picture, when the arrow hits the ground, a big arrow is shown (indicated by a red box in the picture). The collision setting of the ground is set to BlockAll. What’s wrong with this setting and how i can fix it?