Hi esteban,
Sorry, my fault. I had an extra "> in the code. I've edited my post above to remove it. Please remove the code in red below from your wydarzenia-lista.php page:
<a href="wydarzenia-art.php?page=<?php echo @$_REQUEST['page'] ? htmlspecialchars($_REQUEST['page']) : 1 ?>">&num=<?php echo $record['num'] ?>">
What is this record variable in my case?
It must be already correct since the code is working.
Please let me know if you have any questions.