Same here and I wasn't the original owner.I've had great experiences with Bobro and their customer service. I bet they would take care of whatever you need if you reached out to them.
I'd be curious to see the actual strength of the bolts. We had a line of Eyetalian industrial equipment that kept having the wheel bolts break. I took them to a local fabrication shop to be tested. The 'Grade 8' bolts were soft, and didn't have the strength of a grade 2.@kcult Curious. Did you torque those to Bobro's torque spec ... or just kind of wing it? I'm asking because I've read about failures of this sort on Bobro mounts (of which I have a few, myself) ... and I've always been curious if it happened to properly torqued ones.