Check the Shopify admin first
Are the components missing in the admin too?
Open the bundle product and inspect its Bundled products block. If the expected components or inventory are missing there, Shopify recommends increasing one component quantity, saving, then changing it back and saving again to trigger a re-sync.
Follow Shopify's official bundle troubleshooting guidance.
Then check the storefront
If the admin is correct but shoppers see no component list
The native bundle data is present. The remaining gap is usually presentation: the product template needs a section or app block that renders those components on the Online Store product page.