I think the problem is related to Hercules files.
There is a temporary solution for this problem that is to change the scripts of the items in the item_db file.
for example, the Red Potion,
from this Script: <" percentheal rand(45,65),0; ">
to this Script: <" misceffect 204; percentheal rand(45,65),0; ">
However, it might take you a little bit time to change the whole items, which have the same problem.
thank you guys!