Thanks for the screenshot – did you recently subscribe to the channel? If the sub button isn't showing "subscribed", try refreshing the page (sometimes there's a short delay) or signing in w/ a different browser. If those things don't work, let us know.
Appreciate the info – please send a feedback report directly from YouTube with these steps: https://yt.be/help/feedback . While every individual report may not get a direct response back, we do review everything and use the details to investigate and fix issues. Thanks!