One of my friends encountered a bug today.
Apparently there are two types of Camere Cloth, Camera Hats, Oilhaken Metal and Olihakan Crystals. One type comes from level 5 treasure maps and I am not exactly sure where do other type comes from. I assume it comes from Exploration Points rewards or IM. Even tho they look the same, have exactly the same icon and tooltip there's one distinction between them. They are not stackable.
Now that's where we encounter problems. My friend had one type of Olihakan Crystals in his inventory. All other slots were filled. He went to Seville and bought another Olihakan Crystal from other player. His silver decreased, but he never received that Olihakan Crystal he bought. We assume this happened because he bought the other type of Olihakan Crystal which is not stackable with the one he had. The game "saw" he had one Olihakan Crystal, so it did not send him a message saying "Inventory is full" because the game "assumed" it will be able to stack 2 Olihakan Crystals, hence no extra inventory slots is needed. Unfortunately it tried to stack unstackable items, since all 36 slots were full, it probably stored the Crystal in the 37th slot, which does not exists which basically means the item was destroyed.
I am not sure if hes going to get the Crystal back or not. He sent the report to IGG. I decided to share his story here, to warn other players to not repeat the same mistake. When you're buying something, always have a free spot in your inventory, this way it cannot disappear.
I even think this bug was reported before. I think someone had similar issues with disappearing Timber. Its definitely worth investigating, this is a major bug and can cause major loses in game.
Check out various tools for VCO at The Pirate's Cove: