We're sorry to hear about this. Could you provide more details on how to reproduce the issue? What steps are you following? Is it possible for you to share the screen recording of the issue?
Thanks for reporting the issue. As @Tarun Saini mentions, it would help to have more details to recreate the problem. I took a video of a thermostat on a white wall removed the background, and changed the background color to red. I then cropped and resized the video but the output matched the project. If you can help us understand how to recreate the issue we can report it.