RIOT PLS what is wrong with my lp gains

I have 58% win rate overall ( 106-78 ) with about 80% win rate the past month. Won 4 straight promos all the way to Diamond 5 despite having ridiculous low lp gains and high lp losses. . My first 2 games in D5, went 2-0 and gained 14 LP each. Just lost one game and dropped 26! LP.

With these lp gains, i can't climb even if i win 70% of my games which I've been doing. Cant explain it other than a glitch in the system really. Srsly what is wrong with my lp gains??