Why are unwanted records displayed?

Question

WordPress

On the page of a certain category, I'm trying to display posts from this category. The output goes without problems if this rubric has entries. However, if it has no entries, then only the most recent entries from all categories are displayed. I don't understand why this is happening. It is necessary that if there are no records in this category, "No records" is displayed.

<?php
                $cat = $fields['category'];   // определённая категория
                if(have_posts()) : query_posts("showposts=3&cat=$cat");
                while(have_posts()) : the_post();
                ?>
                <div><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></div>
                <?php
                endwhile;
                else: ?> Записей нет <?php
                endif;
                wp_reset_query();

            ?>