After trade Inventory don't gets updated

[HoraK-FDF]

When trading all items of one kind the the inventory slot stays blank if inventory is opened after trade
if then inventory is closed and opened again it seems all ok but it is'nt when picking up another root and opening the inventory the root is not seen, then after closing and opening again its there.

before:

after:

after and inventory reopened:

after and item grabbed from monster again:

after and item grabbed from monster again and inventory reopened: