Kleptomancy Rune gets Changed to Glacial augment playing Acension with GP

Ive played 2 games as gangplank recently in Acension and in both games i had my main rune (Kleptomancy) switched for Glacial Augment, and in the first game i though maybe i had clicked into a different rune page so in the second game i checked around 5 times to make sure i had the correct rune page and i did, then going in game id get a message that said my Rune had been changed to Glacial Augment, is it a bug? or is Kleptomancy not allowed in Acension?

https://gyazo.com/ab6ab200fc637f105406f8a07ffe7d7b

https://gyazo.com/afb90041d94bcaef3766024cd72f358d

https://gyazo.com/18789fe7157f55fc0cb64fb089da8576