For some reason, configuration examples that start with # (i.e., comments) don't get rendered properly. See for example man5/config:

C code seems to work fine. Same with the table in man3/OPENSSL_s390xcap. I used the following code to find spot check for problems:
find . -name \*.pod | xargs grep '^\W*#' | grep -v '#include' | grep -v '#define' | grep -v '#if' | grep -v '#endif'| grep -v '<<' | grep -v '#else'
When I make the docs locally, I don't see the problems in the generated HTML files. For instance, when I open openssl/doc/html/man5/config.html, I see this:

My guess is the problem has something to do with syntax highlighting, but I haven't looked closely at how POD is processed into HTML here.