400 - Bad Request

Suddenly started getting 400 - Bad Request on SOME sections of my site on Chrome on Android.
When I bypass Cloudflare cache by enabling developer mode, the page loads fine. When I disable the developer mode, 400 error again.
Incognito mode is OK.
Desktop is OK.
Other devices are OK.

I have NOT tried clearing cookies because my concern is not this particular device but all potential site visitors who will not bother clearing their cookies and simply leave.

I have rarely, if ever, seen 400 errors from Cloudflare.

Can you share a screenshot of the error?

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