Small Object Physics Interaction With Player

So I have a First Person Template loaded. I have a few blueprints made (a seamless teleporter, a gravity gun, etc.) Not much if anything has been edited in terms of physics or the character (although I did remove the default viewmodel). I duplicated 3 of the cubes present in the template and made them smaller.

These smaller cubes fire away at incredible speeds when the player walks into them. I don’t know much about the physics engine so I don’t really know whats wrong. I notice that mass values seem incredibly high, but I’m unsure how to change the mass of the character if that’s the problem.

If that isn’t the problem, how do I go about changing the force the character applies when it moves into an object?