Shielded from demotion on Platinum IV

Hey guys, I'm really puzzled about the warning that popped out on my account about "Being shielded from demotion but losing to many games to maintain your current ranked" I finished the season on Platinum IV - 0 LP and yesterday i won two ranked games and now i am 34 LP but today i log in and this warning sign appeared. Is it a bug or i really do risk to lose my ranked tier ?

Thanks in advance.