The project are exporting with black bars

Hello! I’m exporting a project in 1080p and it worked fine yesterday. I imported a clip that is 720p after that i get the clip in 1080 with back bars. It exporting as 720p window inside a 1080p file. Even now when I have removed the 720p clip. I use default youtube preset at 1080p. How do I get the video to be full screen again?

Never mind a restart fixed the problem. This can be removed.