Miss Fortune XP counter stuck at 12600

Miss Fortune reached mastery level 4, and the xp count does not increase when I view it in my collection. Just checked before playing a blind pick game and it was at 12600. After finishing a game, i saw the grade i got and it seems like i should get +125 xp for Miss Fortune, but then in my collection the xp is still exactly at 12600.

Before the game: https://www.imageupload.co.uk/image/EGjC Game summary: https://www.imageupload.co.uk/image/EGjU After the game: https://www.imageupload.co.uk/image/EGja