Important: Because I can not Edit my Post…. I will post it here.
Addition To point 2.
I removed “YITH WooCommerce Product Bundles” Plugin and using https://woocommerce.com/products/product-bundles/ because it has more functions and is more compatible with styles and woocommerce.
There is the same problem with the mini cart… See link in private content :). Thank yoU!