Problem with a title in page

Hi. That is because your theme template have not well-written.
Find below line and delete desktop-columns-4 tablet-columns-2 mobile-columns-1 after

tag.

<ul class="grid product-list clearfix desktop-columns-4 tablet-columns-2 mobile-columns-1"> desktop-columns-4 tablet-columns-2 mobile-columns-1

Have you resolved them? I dont see them now.

Why do you need to add that code?
I think the culprit is in your theme, like archive.php/taxonomy.php or something.
However, it looks like you are using premium theme, it would be better to ask the theme author for help.

OK.
Pls try below code instead.
Since function woocommerce_product_loop_start now has filter hook, it would be better use it.
Note this fix might affect other product loop output.

add_filter( 'woocommerce_product_loop_start', 'my_product_loop_start' );
function my_product_loop_start( $echo = true ) {
  $loop_start = '<ul class="grid product-list clearfix desktop-columns-4 tablet-columns-2 mobile-columns-1">';
  if ( $echo ) {
    echo $loop_start;
  } else {
    return $loop_start;
  }
}