What @danb35 says is true - see your history here
But, you were getting Let's Encrypt certs before your most recent. If you are using the acme.sh client to get certs you may have been affected by their change in Aug to default to ZeroSSL. It should have continued using Let's Encrypt for certs that were using LE but some people found that did not work right. See this article from the author of acme.sh