There is a miss behavior in the apxs script from apache22 (other versions not tested)

If you install a apache22 the LoadModule lines look like the following

 LoadModule *whitespace* ${modulename}_module *whitespace* libexec/apache22/mod_${modulename}.so

If you try now to activate/deactivate a module with apxs the result will differ from what you expect

fire up the following commands

$> apxs -e -a -n autoindex mod_autoindex.so
[activating module `autoindex' in /usr/local/etc/apache22/httpd.conf]
$> apxs -e -a -n cgi mod_cgi.so
[activating module `cgi' in /usr/local/etc/apache22/httpd.conf]

This will result into the following httpd.conf

$> grep -e autoindex_ -e cgi_ httpd.conf
LoadModule autoindex_module libexec/apache22/mod_autoindex.so
LoadModule cgi_module libexec/apache22/mod_cgi.so
LoadModule autoindex_module   libexec/apache22/mod_autoindex.so
LoadModule cgi_module         libexec/apache22/mod_cgi.so

As you notice the modules are now loaded twice

Now try to deactivate for the loaded ssl module

$> grep ssl_ httpd.conf
LoadModule ssl_module libexec/apache22/mod_ssl.so

$> apxs -e -A -n ssl mod_ssl.so
[preparing module `ssl' in /usr/local/etc/apache22/httpd.conf]

$> grep ssl_ httpd.conf
LoadModule ssl_module libexec/apache22/mod_ssl.so
#LoadModule ssl_module         libexec/apache22/mod_ssl.so

Instead to deactivate the module a new line will be insert.