And it reached the negative terminal without any issues? From Innovative AT Products install instructions they state on page 9 to use the ground stud on the fender because the ground wire won't reach the battery. I'm wondering if added stress is what caused your terminal crimping to fail.
Edit...
I meant from the outside. I keep seeing a lot of pictures where it doesn't line up straight/flush with the top of the windshield like it does in the pictures from Rampage/Rugged Ridge.
Do you mind taking some pictures of that area when you put it back on? From some of the photos I've seen a lot of people have an issue with it seating flush. I bought one a couple months ago but I've been waiting for a hot day to put it on.