[BUG][GAMEPLAY or CLIENT] Death screen not showing correct numbers

I've been seeing this on and off for several seasons now and thought someone else would post. My apologies, it doesn't look like it.

My issue boils down to this: When I die, and I look at the screen showing how I died, sometimes the information is wrong. Naturally, I can't check this every death, and sometimes I don't even see the damage that killed me.

Tonight for example: I was playing as Nidalee, and overextended. Zed swooped in a executed me. He did 423 physical damage and 211 magic damage as the shot that killed me. Naturally, I looked at the kill screen afterward to see what the magic damage was. It didn't list it at all, but it didn't show the 423 damage (or any numbers that could have included that in it) for the other ability either. It was just absent. There was also only about 600 damage shown out of the 1200-ish HP I had before the attack. He was the only one to attack me for a while, so he was the only person on the screen.

So, there's an issue with the death screen. It doesn't always happen from what I can tell, but either it doesn't work correctly, or my client is reporting bad numbers on the screen, which I hope should be more unlikely.