When you call
$categories = get_the_category($post->ID);
the $post
variable is not defined yet (or is not the one that you expect), because you have to use it inside the loop.
Where you have
<span class="cate"><?php echo $categories ?></span>
replace with (this will output something like “Game, Arcade”)
<span class="cate"><?php the_category(', '); ?></span>
or if you want remove parent cat
<span class="cate">
<?php
$categories = get_the_category();
if( $categories ){
$o = '';
$sep = ', ';
foreach($categories as $c) {
if ( $c->parent == 0 ) continue;
$o .= $c->cat_name . $sep;
}
echo rtrim($o, $sep);
}
?>
</span>
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