Major problem with post displaying

I’m working on a site of small local magazine and I have to create custom start page. Everything would be easier if the design was entirely mine, unfortunately it is a template bought by the owner of the site… I wrote two shortcodes functions and the shortcodes works fine.

functions:

function mainpage2($atts, $content = null) {

$strr = do_shortcode($content);
	        $tekst = '<div class="cat_title"><h2>' . $strr . '</h2><div class="clear"></div></div>';
				return $tekst;

	}
add_shortcode('nazwakategorii', 'mainpage2');

function mainpage1($atts, $content = null) {

$rss = do_shortcode($content);
 $args = array( 'numberposts' => 1, 'category' => $rss );
$myposts = get_posts( $args );
foreach( $myposts as $post ) :	setup_postdata($post);
$eee = _e('Czytaj wi?cej', 'tfuse');
					$tekst = '<div class="post-item"><h2><a href="' . the_permalink() . '">' . the_title() . '</a></h2><div class="post-meta">
					<em>' .  _e('przez', 'tfuse') . '<span class="author">' . the_author_posts_link() . '</span> &nbsp;|&nbsp;
						<a href="' . comments_link() . '" class="link-comments">
							' . comments_number('0 komentarzy', '1 komentarz', '2 komentarze', '3 komentarze', '4 komentarze', '% komenatarzy') . '
						</a>
					</em>

				</div>

				<div class="entry">' . the_excerpt() .'
					<div class="clear"></div>
				</div>

				<a class="link-more" href="' . the_permalink() . '" >
					' .  $eee . '
				</a>
			</div>';
			 endforeach;
	return $tekst;
	}
add_shortcode('postglowna', 'mainpage1');

On my page I’ve got:

[nazwakategorii]Edytorial[/nazwakategorii]
[postglowna]4[/postglowna]

Unfortunately I displays in completly wrong way. Take a look -> https://magazyn.linuxpl.info/

Thanks for your replays!