League Points Bug

Hi, i recently ranked up to s4 and while on 0LP i forgot to lock in, so i was on -3LP and so i won my next ranked game giving me 15LP and so what i thought i would be on 12LP but it presented it with 2LP now i thought it was just lagging and so after won my next game it gave me another 15LP and my overall LP was 17LP when it should be 27LP.

Please help!

Thanks