Different types of hooks(Plate) will work differently with the various loops(Velcro on pad)
3M loop won't stick to many of the backing plates I have laying around here, but that's because the 3M plates(that I have, anyway) use the most aggressive hooks available.
On the flip side, there are some pads laying around here that, when put on the 3M backing plate.... become nearly impossible to remove without tearing the foam. I had to attack one pad with a razor knife and literally cut it away from the plate.
As far as the original topic of pad delamination:
Every single manufacturer that uses a hook and loop system is going to have those issues to some degree. The only exception that I'm aware of is our scalloped-edge pads. But that infallible velcro hold is gained at the cost of our ability to modify the back of the pad in any way. (Recess, bevel, etc)
For all of our other pads, we use a special adhesive that is better than most, but the recipe for making a good connection involves heat, time, and pressure. If you don't have a perfect balance of the three things, bad things can happen. Problems are rare for us, but it does happen.
Foam type also plays a role in how well the velcro will hold. Low PPI foams by nature, simply have less to hold on to.
There's nothing stopping you from gluing the velcro back on though. I would suggest a bottle of Gorilla Glue in the garage for any pad delamination woes.
