This is a little odd.

[minecontemp8]

I was talking to XPlolXD and he asked me if pickaxes are stackable. He said he had a stack of five. He was able to transfer the stacked pickaxes to my inventory and i was able to give them back still stacked.

Here's a picture I managed to snap while holding them. Sorry it'ss so small.

[Pri]

Sometimes things stack, it's not a big deal

[minecontemp8]

Alright. This isn't anything I've seen before outside of the /I command.