Welcome to the Roku Community, @kalankun!
Thanks for reaching out. We'd be more than willing to help you determine the cause of this and find you the best resolution possible.
First, could you please provide a photo of it? Also, does the issue persist after unplugging and re-plugging your Roku TV?
In the meantime, kindly confirm what specific Roku-branded TV this is (e.g., Roku Pro Series, Roku Plus Series, Roku Select Series, TCL, ONN, Hisense, etc.).
We'll be looking forward to your response.
Best regards,
Carly
Carly Y.
Roku Community Moderator