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.
We are now using completely new backpack code. You may now continue using the plugin. However we are still in an "unstable/testing" period. Please report all issues in a brand new thread from this point on.