WordPress post timeline

[Ricods]

Hi,
I want to make a wordpress timeline and I have a problem with that. My code shows in two columns the same post. Any hints what I’ve got wrong?

             <?php $timelineLeft = 0; ?>
                        <?php query_posts('cat=1'); while (have_posts()) : the_post(); ?>
                         
                         
                       
                          <?php
                            if($timeline == 0) {        
                          ?>     
                                 <?php if(has_post_thumbnail()) :?>
                         <div id="timeline_left">
                          <div class="timeline_content animated bounceInLeft animation-delay-3">    
                                <div class="timeline_box">
                                    <p class="timeline_title"><?php the_title(); ?></p>
                                    <p class="timeline_date"><?php the_time('j.m.Y'); ?></p>
                                </div>
                                <div class="timeline_img"><?php the_post_thumbnail('small'); ?></div>
                                <div class="timeline_text"><?php the_excerpt(''); ?> </div>
                          </div>
                          </div>
                
                          
                          <?php else :?>
                         <div id="timeline_left">
                          <div class="timeline_content animated bounceInLeft animation-delay-3">    
                                <div class="timeline_box">
                                    <p class="timeline_title"><?php the_title(); ?></p>
                                    <p class="timeline_date"><?php the_time('j.m.Y'); ?></p>
                                </div>
                                <div class="timeline_text"><?php the_excerpt(''); ?> </div>
                          </div>
                          </div>
                         
                          <?php endif;?>
                          <?php $timelineLeft = 1; }else{?>
                                
                          <?php $timelineLeft = 0; } ?>
                          
                           <?php if(has_post_thumbnail()) :?>
                        <div id="timeline_right">
                          <div class="timeline_content animated bounceInRight animation-delay-5">   
                                <div class="timeline_box">
                                    <p class="timeline_title"><?php the_title(); ?></p>
                                    <p class="timeline_date"><?php the_time('j.m.Y'); ?></p>
                                </div>
                                <div class="timeline_img"><?php the_post_thumbnail('small'); ?></div>
                                <div class="timeline_text"><?php the_excerpt(''); ?> </div>
                          </div>
                          </div>
                
                          
                          <?php else :?>
                                <div id="timeline_right">
                          <div class="timeline_content animated bounceInRight animation-delay-5">   
                                <div class="timeline_box">
                                    <p class="timeline_title"><?php the_title(); ?></p>
                                    <p class="timeline_date"><?php the_time('j.m.Y'); ?></p>
                                </div>
                                <div class="timeline_text"><?php the_excerpt(''); ?> </div>
                          </div>
                           </div>
                         
                          <?php endif;?>                     
                         
                        <?php endwhile;?>
                        <?php wp_reset_query(); ?>
                        

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