Почему не меняется контент внутри pop up окна?

<?php foreach ($arr as $row): ?>											
						<div class="col-md-4">
							<div class="post">

								<a class="post-img" data-toggle="modal" data-target="#exampleModalCenter"><img src="./userimages/<?php echo $row['photo']; ?>" alt=""></a>
								<div class="post-body">
									<div class="post-meta">
										<?php if ($row['category'] == 'izo'): ?>
											<a class="post-category cat-1" href="">Рисование</a>
										<?php endif; ?>
										<?php if ($row['category'] == 'mod'): ?>
											<a class="post-category cat-1" href="">Лепка и Моделирование</a>
										<?php endif; ?>
										<?php if ($row['category'] == 'shit'): ?>
											<a class="post-category cat-1" href="">Шитье и Вязание</a>
										<?php endif; ?>
										<?php if ($row['category'] == 'pod'): ?>
											<a class="post-category cat-1" href="">Поделки</a>
										<?php endif; ?>
										<span class="post-date"><?php echo $row['user_name']; ?></span>
									</div>
									<h3 class="post-title"><a href=""><?php echo $row['article']; ?></a></h3>
								</div>
							</div>
						</div>
						<!-- Modal -->
							<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
							  <div class="modal-dialog modal-dialog-centered" role="document">
							    <div class="modal-content">
							      <div class="row">
							      	<div class="col-12 col-md-6">
							      		<img src="./userimages/<?php echo $row['photo']; ?>" alt="" style="max-height: 500px;">
							      	</div>
							      	<div class="col-12 col-md-6">
							      		<div class="description2" style="text-align: center;padding: 20px;">
							      			<div class="name" style="font-size: 25px;"><?php echo $row['user_name']; ?></div>
							      			<div class="article" style="font-size: 17px;font-weight: 550;color: rgba(0,0,0,0.4);margin-top: 10px;"><?php echo $row['article']; ?></div>
							      			<div class="about" style="font-size: 15px;margin-top: 20px;"><?php echo $row['description']; ?></div>
							      		</div>
							      	</div>
							      </div>
							    </div>
							  </div>
							</div>
					<?php endforeach; ?>