8lp for 4th place tft and i’m bronze 2?!?!

what is this bug?? i’ve played less then 15 ranked tft games and i’ve only got 8th place one, average place is like 4thish, i got 93 lp for a win i got like 3 games again, now i get 8 for 4th?? i duoed with a silver 3 player who got 67 lp for getting second place in the same game. is this a bug??!