Choosing runes in champ select is bugging out

So, every single time I close out of the rune pages, it says, "There was an error setting your rune page." It's been WEEKS. I deleted every rune page I had to start fresh, and it's still doing it!

And then just now, in my RANKED GAME, I equipped my Blitzcrank runes. I selected them and everything. But the game forced me to use my Sion runes instead! Blitzcrank can't use Comet! It's dumb!