Wall Carver challenge not giving credit for collecting all bearings.

I bet I ran the Wall Carver challenge 5 or 6 times only to go around the corner and see 2 of 3 green checkmarks on the Challenge icon. I open it up and it has "Collect all bearings" blank. I run it again, Get to the shut it down screen and it says I collected all bearing. Around the corner and same old crap. Collect All Bearings still blank.