Hello,
This issue is related to the cache of the widgets that WooCommerce plugin added in the last updates. It caches filter widgets and clear the cache after some period hardcoded in WooCommerce plugin files.
We have added the following code to child theme functions.php to disable cache
add_filter( 'woocommerce_layered_nav_count_maybe_cache', function(){
return false;
} );
Check brands now.
Regards