Those sweeps on the bottom of those shower doors have a reputation for tearing...many of us have replaced them just to have it happen again. If you search the forums there have been many discussions about it. Many of us have given up on the sweep, and have discovered that water does not leak out as a result. Water would have to come up and out, and that doesn't happen with ours, so I have given up on the sweep.
2011 GMC Sierra 2500HD
2014 Rockwood 8289WS, Diamond Pkg.