Color manual pages are not rendered correctly (e.g. highlighted text are rendered as characters repeating twice, etc.). For instance: https://www.freebsd.org/cgi/man.cgi?query=grotty&apropos=0&sektion=0&manpath=FreeBSD+10.2-RELEASE&arch=default&format=html
Over to maintainer.
I can confirm that man.cgi cannot handle "bold underline" correctly. I will see if I can fix this.
Fixed in rev 50834
A commit references this bug: Author: wosch Date: Thu Sep 14 11:38:14 UTC 2017 New revision: 50834 URL: https://svnweb.freebsd.org/changeset/doc/50834 Log: handle underline text PR: 203109 Changes: head/en_US.ISO8859-1/htdocs/cgi/man.cgi