Teleport not showing in cooldown after using it in a ward

I was playing a normal game in the summoners rift as , I saw trying to steal our blue so I used from top to a ward in the blue buff bush and it didn't show like it was in cooldown. I couldn't use it again until the cooldown time passed but it looked like it was available.

The second time I used it, the cooldown showed correctly. That time I used it in a pink ward.