My inventory seems to be bugged. Only the first arrow that I place down with Archer's Wand is able to be fired, the other one is becoming 'disabled' for some reason. I have tried setting up the bottom one first, and (on a different encounter) the top one first. Either way that I do it one of them becomes disabled but the other one doesn't. I imagine the Barbell item is bugged somehow.
Sidenote: Bombstone + Archer's Wand + any 3x1 bow is SO good. The only thing its struggling with is encounters with 4 mobs at once, and I was able to somewhat fix that with the Ninja Costume to give me 1 free dodge each turn.
Edit: I figured out the culprit of the bug. Its actually the duct tape. Swapping its position with the Coins seems to have resolved the issue. My guess is that that Duct Tape is treating any tile around it as a tile with an item in it, even if that isn't the case. And due to that effect it interacts with the Barbell in a really nasty way.