Under lvl 30 being Diamond (?)

Well, I just found a little bug on LoL client. You can see there's the Diamond icon and it says 1# ELO, but the account is on lvl 23 [zombie-brand-mindblown] > https://gyazo.com/621331d2b87effb820a9719b1647a389 > https://gyazo.com/027a2f7ec137df325ec2170eb66faf1a