[NOTED] A quest is unplayable

The Paztek Oddysey requires you to place 8 arachne legs on pressure plates. But thé problème hère is the bottom right plate is obscured by the inventory Windows, so it is impossible to finish this quest. Please make that when u try to drop an item on thé ground thé inventory Window closes automatically.
PS: im talking about Dofus Touche Here.