Quantity is counted incorrectly

Hello,
I use the plugin and I’am really happy with it. However, I have a problem: I have activated the All in One Product Quantity for WooCommerce plugin, which enforces quantity steps in the shopping cart. So it can only be ordered if there are at least 6, 12, 18, 24 and so on products are in the shopping cart. If I now have a bundle with 6 simple products, the plugin only counts one product and no order can be placed. What can be the reason?

Thanks for the help.
Regards
Martin