[LVL ED] Key not appearing in the map!

[TimProzz]

Hello, so I'm making a custom story and actually making a lot of progress with my map, but I have a little problem.

I just placed a key in my map, it does appear in the level editor, but it doesn't appear in the game itself. But I can still pick up the key, use the key on the door but it's just not visible.

Which is weird because I already have a few keys in my map but with the other keys I don't have this problem.

I tried restarting my map, I tried restarting the game, I tried restarting my level editor.

Screenshots:
1st screenshot: http://i.imgur.com/bAyPqEv.jpg
2nd screenshot: http://i.imgur.com/gdSD06U.jpg
3rd screenshot: http://i.imgur.com/5qpETVO.jpg

Is this a common problem? And what can I do to fix this?