why is it like this

I hit radiant in NA and i win 5 in a row with 3 match mvps, gain 74 RR
I lose 3, lose 70

WHY IS A LOSS 22-25 AND A MATCH MVP WIN 14???

in 3 games i went from rank 209 to rank 470

stay in radiant this act ur gains will increase and ur elo will not decrease much