This is a known bg according to woocommerce tech support
“I have done some testing and found out that the Product Bundles – Bulk Discounts?is not compatible with the latest version of the Product Bundles?extension.
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Please note that the Product Bundles – Bulk Discounts?is an experimental plugin that has been created to validate and refine a feature that may be rolled into WooCommerce Product Bundles — or dropped! — in the future. Also, support for this plugin is provided via www.ads-software.com on a voluntary basis only.
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Therefore, you will need to report the issue to the www.ads-software.com support forum. I see that this has already been mentioned here??????, and I recommend that you add your comment there as well so that the development team can take a look. I will also notify them internally.
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If you wish to continue using the Product Bundles – Bulk Discounts?plugin, you can continue using the older version of the Product Bundles extension.”