Help! When use sign-up page and appear NET::ERR_CERT_AUTHORITY_INVALID

Hi This is my site:
I use google cloud platform and bitnami and wordpress
and use really simple ssl and Cloudflare.
When customer use sign-up page ,and it show NET::ERR_CERT_AUTHORITY_INVALID
I can’t find the question ,could anyone help? thank you

The top right buttons redirect to, you’ll need to fix this on your origin server/your web application code.

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