Hi there! It may be an issue with the graphics card or possibly the display itself.
I would suggest to make sure that your operating system is updated to the latest version and check that your graphics driver is updated to the latest version. If your hardware has multiple graphics cards, please make sure that all graphics cards are updated.
If the issue still persists, please reach out directly to the support team here.
Be sure to use your Figma email account, mention the steps you did. Hope that helps!