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I found a glitch last night where if you purchase items extremely quickly in the shop that the shop inventory may state a different number than your actual inventory.
Normal starting build - Machete + 5 potions.
When starting i buy machete then go to potions and click buy as fast as i can until it doesn't let me buy anymore. This caused the shop inventory section to say i had bought 6 potions (only have enough gold for 5). The actual inventory though still only shows 5 so they do not match up. Will try and replicate and post a screenshot later. It doesn't work every time though.