Resolution problem in game

So basicualy what is happen is that i reinstall my PC and after that i got 1280x1024 as default resolution on dekstop and leauge of legends(i was playign on 1376x768 before reinstall). When i go into video options, its shows me that my recomendet resolution is 1280x1024 and its fucking ass. I mean i got good fps but the game is so scretched that i cant see the players on map like normall. I try to get the old resolution using nvidia control panel custom resolutions, but the resolutions is even worse than the new one- scretched as fuk and it got black bars. So im asking did anybody can help with this problem? Thanks in advance.