Have you tried clearing cache and cookies? Here's how: https://goo.gl/dwzcyo . Let us know if that clear things up for you.
I'm having this issue too, and I'm pretty sure MANY others are too. Looks like it is a bug/issue on the site. After clearing the catch it works fine, but notice when I switch back to "Creator Studio" the problem occurs again. Could just be a creator studio glitch.
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Appreciate the report, we're currently investigating!
Thanks. Twitter will use this to make your timeline better. UndoUndo
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