Invisible Pink Wards [Gameplay] Found in Ranked game

Ok so i was in a ranked game with a few of my friends trying to get out of our current ranks. I was playing Kindred Jungle and we were winning. So we were pretty far in the game where i could solo dragon while they were trapped in base. So i walked into the dragon pit and didn't notice anything, when i attacked dragon it flew up and did its knock-back, but as it did its wing went over once section of the pit and a pink ward showed up, i was surprised to see it and though my eyes were just tricking me since it disappeared right after. So with further inspection of the pit i found that this pink wards could only be seen by me when i walked over the area.

So after we won i jumped into a custom game to see if i could recreate the bug and sure enough i did, http://i86.servimg.com/u/f86/17/61/44/86/img_2610.jpg http://i86.servimg.com/u/f86/17/61/44/86/afa59111.jpg http://www.servimg.com/view/17614486/170 So the first Image is my screen where i can't see the pink ward, the second image is my friends screen where it is visible to them, the third is showing that it was only visible when I was on top of it.