Glitched Pickaxe?

I was remodeling my base and I went to move my cave spider spawner. I bought the cave spider spawner pickaxe via vshop and when I went to break it, it didn't drop. I unfortunately don't have screen shots of it because I never had this problem before with my other spawners but heres a picture of the faulty pickaxe. Also a picture of me any my friend discovering the spawner in a mineshaft. 2018-03-31_16.23.22.png 2018-05-18_10.02.19.png