I wish match history would ALWAYS show my grade.

Why do some of the games in match history show your grade, and some don't? I can see the grade on the end game screen, but after I close that screen, it doesn't always show the grade in the match history tab. These are champs I've played a lot this season, enough that it definitely gave me a grade on every game, it simply doesn't always show it, and I'm not sure why not. https://i.imgur.com/IrrvYhU.png
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