Save game attached. After I cleared a level of Braxs. Place 'some' items on a shelf and your prompted to sell/not sell the item. If you sell, you get the zorkmids and the item is placed on the shelf. If you do not sell, the item is not placed on the shelf. If the item is sold and placed on the shelf, when your pick it back up, your prompted to buy/notbuy/pickup. You can not sell the sold item again. Active Mods: DiggleGods official expansion JayPhonemesV1 Interior Dredmorating Inquisitor Essential DoD Dragon Aspirants.1.1 Dragon Knight 1.2c Clockwork Knights2.5 Essential Core Skill Rebalance v.01
Updated and a clarification: This has occured after Brax is murdered (I attack him without angering him). The shelf that wants to buy and item seems to be Dungeon Level independent. I can resell a sold item on 1 shelf per dungeon level. So, if/when you play with the save, try selling the same item on one or more different dungeon levels. I also have been traveling up the levels, from level 5 to 1 to Krong and steal items from Brax. Brax/shops have been a bit wierd. I've also had the "you have 0 zorkmid" bug on level 1. After that happened Brax moved to block the door and would not let me IN the shop. Then when I left the area, I was warned that I stole an item and I was in trouble. Brax commenced to attack and summon. Hope this all helps.