Ghost Subscriptions "Insecure content blocked"

I have Ghost running on the Bitnami AWS instance.

But every time I try to add a user for signup/subscriptions, I get this error here:

The loading bar goes on forever, and the website freezes.

I’ve replicated this on both of the Pico and Lyra themes.

My gut feeling is that the website’s ‘Let’s Encrypt’ http to https redirect is what is causing the issues.

Website is at:

Any help would be appreciated.

I looks fine here… may be you fixed it