my sellable items look like this as i changed them.
shopModule:addSellableItem({'vial'}, 7636, 5, 'vial') --SELLABLE = Items you are able to SELL to the NPC
shopModule:addSellableItem({'vial'}, 7634, 10, 'vial')
shopModule:addSellableItem({'vial'}, 7635, 15, 'vial')...