Thanks for using Bitnami. Can you give us more information about your issue? I visited your website and the certificate is valid.
Apart from that, we have a Support Tool that will gather relevant information for us to analyze your configuration and logs. Could you please execute it on the machine where the stack is running by following the steps described in the guide below?
How to Run the Bitnami Support Tool
Please note that you need to paste the code ID that is shown at the end.