Hello,
I am having a similar problem.
When a customer adds a bundle to the cart, in the check-out the system adds the bundle AND the individual items from the bundle to the receipt. Sometimes it adds the prices of the individual items (and then the amount is incorrect for the customer), sometimes it adds the products but prices are 0 EUR.
Also, the extra individual items are not shown in the receipt for the customer (customer receives a receipt with a bigger amount), I can see them just in Woocomerce orders section.
And this doesn’t happen always, sometimes everything works fine! I have a suspicion that the trouble starts when a different language is used on the website (we have a multilingual page with 3 languages), but I am not 100% sure.
This problem arose just recently, before everything worked fine.
I hope this comment will reach hearing ears and someone will be able to help!