Rocker studs snaping
I turn the lighting on my phone up so I could see yer original pic ...and now I noticed it's pretty obvious that they were too short ....you should never ever have so few threads engaged with the adjuster nut.
You want at least 2 threads showing above the adjuster nut.
That's the how they are usually broken.
You also had the rocker binding. Like getting an uppercut and ball kick at once.