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After latest Google Chrome browser update a new issue arose with menu display. 
Please, check this article https://mikado.ticksy.com/article/11648

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Why are my contact forms broken?

Your contact forms are not actually broken, the reason why you are not seeing them correctly is because you probably haven't installed and activated the Contact Form 7 plugin before importing the demo content. You should just install and activate the plugin, delete the menus that already have been imported from the Appearance/Menus, so that they wouldn't get duplicated, and import the demo content again.