SCREEN POSITION BUG [CLIENT]

suddenly while in a game the LoL screen set itself in a lower level and at that level with unlocked camera i can go up,left,right but not down and i dont see a small part of the screen at the bottom. I use legacy client cause i downloaded beta client and i had this bug: http://boards.na.leagueoflegends.com/en/c/bug-report/OrlYQXbP-client-will-not-open-after-i-click-open, so i had o reinstal LoL. I restarted pc but it didnt fix.