How can I stop my header disapearing on desktop?

For whatever reason, the nav header keeps disappearing on desktop only. How can I fix this? Right not it is doing it for the about page – https://www.tradeinsulations.co.uk/about-us/

Hello,

Your problem is not clear enough. https://gyazo.com/865845db0901a0e0103b81a989d1394f

Please provide page URL and screens where navigation disappears and where does not.

Best Regards

[Author]

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