Hi @RonnieBeas
Thanks for reaching out here in the Community!
We recommend doing a restart of the Roku. Settings > System > System restart. Then If that doesn't work, try adjusting the Display type settings manually Settings > Display type, and set it to your set's actual resolution instead of "Auto detect"
We suggest also checking this page for tips and troubleshooting steps for this type of issue: How do I change the display type on my Roku® streaming player?
Regards,
Karla