Sorry for the late reply. I have checked this case. The Summon Stone is working perfectly fine.
If your game is patched (up-to-date) and you choose Chungha item, you receive Chungha item.
It is your personal responsibility to keep the game uptodate and to make sure you select the correct item.
This issue can only happen if your game is not patched or you misclicked, we don't roll-back/restore items in such cases.