Could you please take the widget blueprint out of your project, or at least out of the viewport of your game and see whether or not the issue goes away? If that’s the case, it may come back to being a bug on the widget blueprint.
If you’d like, you can always upload your project to or something similar and provide a link to me in a private message on the forums.
If not, being able to reproduce this with steps would be the next thing I’d ask for.
Thank you! 