Page navigation not working correctly on index but only on categories

Andre, you are using $paged variable as an argument for your query, but you haven’t declared that variable. Try declaring that variable above the arguments using:

<?php
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
?>

Hope this will solve your problem.

Moreover its better to use the content for postcover.php on the same page instead.

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