I also have troubles with:
1) How do I make my menu headline unclickable? When there’s dropdown options, I don’t want the header itself to be clickable
that’s weird, maybe one of the plugin you are using might be the source of this issue, can you try deactivating all of your extra plugins and see if the issue has gone, then activate them one by one to find out which one is causing this issue.
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Thanks for your advice. I have deactivated Yoast SEO plugin and blog starts working in a good way. After activation this plugin again the blog still working well.