HaProxy not using updated certificate from LetsEncrypt

I have an HAProxy server running on Debian 10 on which I have configured a SSL certificate utilizing LetsEncrypt and certbot. My certificate has been renewed however HAProxy is still serving out the old certificate even after having been restarted multiple times. Restarts have included stop and start with significant delay between of both the HaProxy service and NGINX service. This is a problem I’ve never encountered before in any web app that I’ve worked with. Any thoughts on how to correct this?