Ugh, that's frustrating! Sounds like a classic JavaScript conflict or perhaps a broken CSS element. Have you tried clearing your browser cache and cookies? Sometimes a simple refresh is all it takes. If not, maybe inspect the element – could be a tiny error preventing it from fully expanding. Reminds me of when my  Wordle Unlimited  board gets stuck! Good luck!

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you are using a caching plugin or a CDN (like Cloudflare), temporarily clear your site cache. Minification processes can sometimes break the specific inline scripts responsible for loading dynamic header blocks. 
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Because you don’t have enabled registration 

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