Wrong counting of products in the cart

Hey!
I have a big problem and I dont know how to solve.
In my online shop I want to sell wine but my customers have to buy minimum 6 bottles and the quantity step should also be 6, so that they only can buy 6, 12, 18…bottles. For that I use the plugin “All in One Product Quantity for WooCommerce” and it works fine. For product bundles I use “WPC Product Bundles for WooCommerce”. The problem is that “All in One Product Quantity for WooCommerce” says that I only have 1 product in my cart if it is a bundle with 6 bottles/articles. In my cart the number of product is 6 but I think “WPC Product Bundles for WooCommerce” only counts the bundle as a product.
A few weeks ago both plugins worked perfectly together but right now there is this bug. WordPress, Woocommerce and both plugins are updated to the latest versions. I have no idea which plugin is causing the problem. Is there anyone who has the same problem or has an idea how to solve my problem? Thanks in advance!