We first noticed this with our mecanum test bed which has last year years bumpers on it. Its bumpers are at 5 inches & the balls just compresses & rolls under it. Robot is around 40-50 lbs. The Locomotion bot is 119.9 lbs. (Don't ask how that happened

) It was unpowered & pushed to the ball. The ball compressed & started under the bumper. We stop when it was clear that it was not going to bounce off. We will play with it (oops investigate) more tomorrow.