Could not see enemy champions in game or in tab

Ok I was playng skarner jungle i could not see the enemy champions on their team morde and sivir at all they still did damage to me etc but i could literally see them there was no way i could attack or target them whatsoever and when there morde said "gg" in all chat it showed up as green text and when our towers were being destroyed it came up as a bunch of text with a blue picture for whoever destroyed it "game_announcer_..." i forgot the rest of it