403 Responses for some of the users

Hiya, I have noticed some of my clients in my website (that msgd me and told me) are receiving error 403 on some requests in the website. It is not for all clients, it happens only to some of them, half of the website works but the other half of the website does not work. Looking at the HAR file they sent me.

Any idea what it could be? is there a place I can see logs on why it happened in cloudflarE?
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