Manpage print/formating problem

[cephalop0d_(_at_)_t-online_(_dot_)_de]

Hello List,

I'm trying to print nice looking manpages as outlined in
http://www.openbsd.org/faq/faq2.html#2.3

but the output is not quite what I want:
each command headline and the synopsis end up with ddoouubbllee
lleetttteerrss (<- like this ;)

Did I overlook anything? The command I used was:

groff -mdoc -Tps < /usr/share/man/cat1/zcat.0 > /tmp/zcat.ps

I also tried

groff -Tps -mandoc < /usr/share/man/cat1/zcat.0 > /tmp/zcat.ps

just in case.

Any help appreciated,
-Marcos