Red exclamation point for site security

I have a site that Brave for iOS keep showing this red exclamation point for site security. It’s https, other browsers don’t complain about it and Brave desktop even says the site is secure. Any thoughts on why the Brave mobile shows this warning?

From what I can find documented there is no red exclamation point, just a yellow one?

I also have this happening. I haven’t seen an explanation

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