I am having the exact same issue. @binhex can you please update the container to the newest version so all of us having issues can get it resolved. Thank you!
EDIT: Update ran. to version .1999 This fixes the issue.
NOTE: you may have to remove and re-add the IPT entry in Jackett
Has anyone set this up with letsencrypt yet? I am going to be attempting this soon and wanted to know if anyone had the .conf file already made and available to share.