Demotion bug, be careful!

​Hi. Last night I was in Silver V, in promos to get into Silver IV. I lost my first promo and went to bed. I woke up today, lost my 2nd promo making me unsuccessful in my promotion series and I was demoted all the way to Bronze I? Surely this is a bug!? The "you have been unsuccessful in your promotions" popup in the post-game lobby was gibberish code. Or is this normal? Because I'll be quitting LoL if that's the case.
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