Problems with multisite subdomain

I have a wordpress multisite network set up. The subdomain (courses.helenmpicture.com) is set up with a CNAME. When I am logged in to the site, everything looks fine. When I use incognito mode, the main page shows the default 2022 theme. Other pages (ex. courses.helenmpicture.com/contact) work fine. Is this something to do with the setup on Cloudflare’s side?

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