Why is it showing Option values provided for 1 unknown option(s)?

This is because the variant options of the linked bundle products are deleted. When the options are deleted, the app cannot create new variants for the product. 

The incorrect variant options:

The default variant options:

How to fix the issue?

There are 2 ways:

1. You can enter the app and save the bundle. The linked product will be reset.
2. Manually edit the linked product. This product has the same name as your bundle. You can find it in the Shopify product admin. Just add the missing product option to the product.