Okay, turns out I'm a nub. Apparently stuff you pick up when your inventory is full goes into your backback... Still don't know why there was a stack of 0 mushrooms but at least I'm not getting other people's stuff.
I have special interest in the empty mushroom stack...do you have any idea what could have caused it? Even a guess only? Did you pick up any mushrooms that might have bugged into the backpack?
1.8 has a funky think with 0 for items. ./shop had the same thing for a while, not sure if it still does.
/shop, /travel, /recipe...all have it. The disadvantage of empty stacks in 1.8. There are some reasons why the 0-stacks can be very useful for experimenting. :3 Btw: Jamie, you are spamming my alerts...6/6 alerts within the last 20 minutes are from you, all from this forum section.
