I stumbled upon bad special characters in some manpages:
If your terminal is a "true" auto-margin terminal (it doesn▒<80><99>t allow the last position on the screen to be updated without scrolling the screen) consider using a version of your terminal▒<80><99>s termcap that has automatic margins turned off. This will ensure an accurate and optimal update of the screen in all circumstances. Most terminals nowadays have "magic" margins (automatic margins plus usable last column). This is the VT100 style type and perfectly suited for screen. If all you▒<80><99>ve got is a [...]
I have done some research.
$pager as its display tool and this is set to
less in my environment. So apparently
less is not able to display the man pages's special characters.
My terminal (putty) is set to Utf-8, and
$LANG=en_US.UTF-8. What can be wrong?