Don't know what's going on with that pad, but I must admit that I get somewhat aggressive when cleaning my pads using the same method as you, and mine don't ever look like that. It almost looks like the adhesive for the velcro backing started to let go when it got wet, and allowed the velcro to shift a bit. I'd keep an eye on it, and see if it lets go completely. At this point, you're in no danger of anything, just keep an eye on it. I'm sure whoever you bought it from will back you up, most do.