Why do my rune pages keep disappearing??

My friend made me really good Teemo rune pages and I had a Rakan page and they deleted after I updated my client which I understand bc it's an update, but I made another Rakan page, a Miss Fortune page, and I temporarily use the domination and sorcery page for Teemo. But they all deleted one day, no update, just gone! Why??? Is it a bug? Now idk if I should make anymore because they might get deleted and I'll be continuously wondering what I put exactly and trying to remake it and it'll be a mess :/ [sg-janna]