but i saw from other people post and their icon is actually appear the original, so i assume there must be a way to fix this ://
Viewing post in not original icon game
The fix would be required on developer's side.
But on your system you can do these https://duckduckgo.com/?q=how+to+customize+an+icon+on+desktop&ia=web
(Set an icon manually in the properties of the desktop shortcut. You might need to create a custom ico file first.)