[critical RP bug] receiving less than half of given points at ranked RP summary

My friends and I have been grinding ranked for the last week or so, and we've had this bs bug happen a few times. Honestly have no idea how ranked RP is so bugged this season despite not touching ranked at all (first the reset to rookie bug that happened to me twice, then still after the bandaid fix you still get visually +0 RP sometimes).

I've attached 2 pictures and you can very quickly see the math is wrong here and the game is messing up.

The +71 RP picture is supposed to be +129 RP. That's what I saw for a good 10 seconds before we died that game. -58 +95 + 92 = 129 yet the game awarded +71 RP. and this isn't a visual bug, this is actual RP given. You get scammed out of RP.

The -8 RP picture is another scam bugged RP match where I was supposed to get +48. -61 +55 +54 = +48. not -8. Obviously.

Nothing goes wrong throughout the game, it's not a match that gets DDOS'd (which you get every 1-5 games in Diamond), but the moment we get that summary screen boom RP gets scammed.

How is the system screwing up basic math and rp gain? Why is this a thing?