I'm having the same problem but when I log into another character, the keybinds show up for a different character. Potions that I don't have on my first character but is on my second character is now appearing in my first character, but the potions …
I know that the new patch update stated that the Coin Shops should be fixed: https://maplestory.nexon.net/news/64925/update-scheduled-minor-patch-january-27-2021
But I am still getting this error:
"Due to an error, the trade did not happen."
…