When these were first released they ended up being my go to pellet for seveal of my rifles including ALL my HW springers. They were wonderfully accurate. Then for some reason they redesigned them and put them in newer packaging and they are terrible. I did not experience the deformities you have but the rifles that use to put them into a single hole were now shooting 2" groups...at 10 yards! And I don' t mean 1 rifle but all of them. Usually redesigned pellets offer some improvement but in this case they failed miserably.
I just received a tin of these H&N Sniper Medium Pellets from Pyramyd Air (Batch CN180727.90804.18 D34346). These pellets are total junk. The skirts are literally paper thin. Many of the skirts were deformed, and a number of them even had sections missing from the skirts, as shown in the attached image. I didn't even bother shooting them. These pellets are heading to the trash.