The bottom part is cut off on OBS when im recordding

So I decided to take up recording, at when I recorded the screen was black cuz i did game capture and monitor capture but I read somewhere that elague has to be on windowed mode. So i do windowed mode, I get fed, win game, I post it on youtube, then I re-watch it , then I notice something very bad, when im in game, a big part of my monitor screen is cut off. I'll link the youtube vid