Few things. If you are lighthearted please disregard and move on.
If you were to imagine how that frag arrived on that plug, what would be your first guess? It didn't just float around and say, you know this looks like a great spot to rest. It was glued. I'm sure if you did much needed due investigation before buying this frag, not only to keep it alive but how, and where to place in your tank I'm certain you would have stumbled across videos of how to frag where they would show superglue and many other forms of putty.
Also that frag is missing flesh. I'm not sure if it came that way from your LFS or happened under your watch, but it doesn't look good. Hopefully it springs back to a thriving colony.
I would strongly suggest reading through the many wonderful and informative posts on this forum before buying any more frags, and fish.