"Normal" text showing up on video, but there's no text layer. How do I remove it?

Hi,

So I recently just noticed a text "Normal" on the videos whenever I play it back from the source or in the sequence. But there's no text layer. It just shows like an overlay or something. When I export the video, thankfully, it isn't there. It's just annoying to see it on the playback whenever I'm working on clips.

Is there a way to disable this?