Space between lines – Can't remove them?!

Hi all,

I have tried and tried to do this, but I’m a bit of a novice and I need some direction. Thanks in advance to anyone who might be able to help.

The site is: https://www.thegymbuzz.com

The current issue is: Half way down the page, where it says “Browse by Well-Known Brands”, the categories that are in there have some space between each line. I can’t seem to remove it.

I believe the coding for this is in the plugin itself and not the theme (but, of course, I might be wrong.) I have been into the coding and taken out what I didn’t need and experimented removing different bits to see what worked but nothing has.

The code is:

<?php
/*
Plugin Name: Category Post List
Plugin URI: https://www.jameswilkesdesign.co.uk/wordpress-plugin-to-display-all-posts-in-all-categories/
Description: Gives a complete list of categories and all the posts in them.
Version: 1.3
Author: James Wilkes
Author URI: https://www.jameswilkesdesign.co.uk/
License: GPL3

Copyright (c) 2010 James Wilkes https://www.jameswilkesdesign.co.uk/

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

set_time_limit(20);
ini_set("memory_limit","128M");

function jameswilkes_catpostlist_content_handler ($content) {
	$tag = "[jwcatpostlist";
	$closetag = "]";

	$i = -1 + stripos("x" . $content, $tag);
	$j = -1 + stripos("x" . $content, $closetag, $i + 15);

	if (($i >= 0) && ($j >= 0)) {
		$before = substr($content, 0, $i);
		$after = substr($content, $j + strlen($closetag), strlen($content) - $j - strlen($closetag));

		$tagcontent = substr($content, $i + 1, $j - $i - strlen($closetag));

		$categorylist = array();
		$postlist = array();

		$orderby = "date";
		$order = "asc";

		$orderby_accepted_values = array('date', 'modified', 'title');
		$order_accepted_values = array('asc', 'desc');
		$params = explode(" ", strtolower($tagcontent));

		$gotincludecats = false;
		$includecats = array();
		$excludecats = array();
		foreach ($params as $param) {
			$name = "";
			$value = "";
			if (strpos($param, "=") > 0) {
				$name = substr($param, 0, strpos($param, "="));
				$value = substr($param, strpos($param, "=") + 1);
			}
			if ($name == "orderby") {
				if (in_array($value, $orderby_accepted_values)) {
					$orderby = $value;
				}
			} else if ($name == "order") {
				if (in_array($value, $order_accepted_values)) {
					$order = $value;
				}
			} else if ($name == "includecats") {
				$includecats = explode(",", $value);
				$gotincludecats = true;
			} else if ($name == "excludecats") {
				$excludecats = explode(",", $value);
			}
		}

		$posts = get_posts("orderby=" . $orderby . "&order=" . $order . "&numberposts=9999");
		foreach ($posts as $post) {
			$postname = get_the_title($post->ID);
			$postlink = get_permalink($post->ID);
			$categories = get_the_category($post->ID);
			$postlist[$postlink] = array($postname, $categories);
			foreach($categories as $cat) {
				$catID = $cat->cat_ID;
				$catname = $cat->cat_name;
				if (!array_key_exists($catname, $categorylist)) {
					$categorylist[$catname] = $catID;
				}
			}
		}

		// get list of category IDs ordered by name
		$sortedcats = array();
		foreach ($categorylist as $catname=>$catID) {
			array_push($sortedcats, $catname);
		}
		sort($sortedcats);

		foreach ($sortedcats as $catname) {
			$catID = $categorylist[$catname];

			$usecat = true;
			if ($gotincludecats) {
				$usecat = in_array("" . $catID, $includecats);
			}
			if (in_array("" . $catID, $excludecats)) {
				$usecat = false;
			}

			if ($usecat) {
				$postlisttext .= "<class=\"jwcatpostlist\"><a href=\"" . get_category_link($catID) . "\">$catname</a>\n";
				$postlisttext .= "<ul class=\"jwcatpostlist\">\n";
				foreach ($postlist as $postlink=>$postdata) {
					$found = false;
					foreach($postdata[1] as $postcat) {
						if ($postcat->cat_ID == $catID) {
							$found = true;
						}
					}
					if ($found) {
					}
				}
				$postlisttext .= "</ul>";
			}
		}
		$content = $before . $postlisttext . $after;
	}
	return $content;
}
add_filter('the_content', 'jameswilkes_catpostlist_content_handler');

?>

Thanks and hopefully someone can guide me here.