Siteground Optimzer caching removes header from all pages

Hi,
I am using the Space Sylvia theme in combination with Siteground Optimizer for caching and other optimizations.
Every day when I visit my website the header/menu on my website has disappeared. As soon as I press “Clear cache” again, the header appears again. How can I make sure that the header remains normal and I can continue to use caching?

Hello,

As we can see, the header is currently displaying correctly. Please, contact us once you see the problem on your website and don’t clear the cache so we can check it.

Kind Regards

[Author]

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