[EricH]

Originally Posted by hillale

It says in the description that it actuates entirely within the bumper perimeter, so I'm sure they know what they're doing.

It may just be the perspective, but I think they're outside the bumper perimeter. Bumper perimeter and robot perimeter are two different things, and they say robot perimeter. (You can have your entire robot within the robot perimeter, i.e. the bounding box, but still be outside the bumper perimeter.) If they are outside, it's a quick fix.

Edit: I've been looking closely at both pictures posted of this robot. The front seems to be OK; the back is questionable. It looks to be about 1-1.5 Globe-widths behind the rear support, which would put it right at the back edge of the frame or just over. A picture--either up or down--of the side view would help.