Last underscore in a code block doesn't show up

The following code block shows an underscore in the first input_file instance but not the second one. After some experimentation it appears that the last underscore in a code block does not appear properly. A workaround is to put an underscore after your code which will not appear but will make your last real underscore appear. Feels like a CSS bug.

# For sam:
/data/sympa/bin/sympa.pl --create_list --robot globe.gov --input_file /data/sympa/etc/listcreation.xml

# For theoden:
sympa.pl --create_list --robot theoden.globe.ucar.edu --input_file /path/to/my_file.xml