Thanks for using the extension, and thanks for the feedback! Unfortunately I couldn't reproduce the issue you are facing, I suspect it may be due to YouTube's A/B testing, which means your version of YouTube is slightly different from mine, at least temporarily. Hopefully it resolves itself after some time, if not I would have to wait for whatever code they changed to reach me before I can update the extension accordingly.

Another possibility is that you have an extension that interacts with this extension in unexpected ways, that was installed recently or that you always had but it got updated recently. You could try disabling all other extensions and then refreshing your YouTube page to see if it's still broken.