Broken offset shackle bolt

Hi guys,

I am restoring an Australian version of the A-body.

I went to install the Mopar offset shackles. As I tightenned one of the nuts the bolt broke. Jegs claims I overtightenned which I know I didn't.

I wanted to find out if any of you had such an experience with this. I find it hard to believe that these would break given what they are designed to do.