If you're seeing that the 'Videos' and 'Video series' tabs lead to the same page on mobile, add a +vote and let us know in a comment. We're looking into this with the right team and will let you know as soon as we have updates.
Thanks for all of the info. We've let our tech team know, and they're investigating this.
We don't have an exact timeline for a fix, but we'd recommend keeping an eye out for updates to the app.