The Sneaky demote

so basically lost a game in plat 2 on 0lp, after the game there was no message to say i was demoted and i thought, oh kl lucky me i get to stay in plat 2. however just as im about to leave the page my eye catches "Moved to Platinum 3". oh, so i was demoted then. never happened before, usually if im demoted, it annoyingly tells me right in my face. but i felt this was a very sneaky way of being demoted, if my eye hadn;t of caught that i would have thought i was still in plat 2