Category & Post Count On One Line

it is caused by some style for the category links with ‘display: block;’

which you may want to keep because it is for the styling of the whole line background.

you could add a filter function to functions.php of your theme, to ‘pull’ the category count numbers into the link:

add_filter('wp_list_categories', 'cat_count_inline');
function cat_count_inline($links) {
$links = str_replace('</a> (', ' (', $links);
$links = str_replace(')', ')</a>', $links);
return $links;
}

obvious change – the numbers in the brackets are now part of the link – and should be on the same line.

try to add this filter code to functions.php of your theme:

add_filter('get_archives_link', 'archive_count_inline');
function archive_count_inline($links) {
$links = str_replace('</a>&nbsp;(', ' (', $links);
$links = str_replace(')', ')</a>', $links);
return $links;
}