May different products have different text % based on business requirements which products admin have added in the group. So when the customer added the product quantity and data from PDP the tax will be calculated based on that.
If my answer is helpful full then please set the accept solution flag and kudos flag so other members can take the same reference.
Hey..! When you look at a list of grouped products in Magento, it often does not show the VAT. Instead, it merely shows the basic price of the lowest item without tax. Check the Tax Display Settings under Stores Configuration to resolve it. If necessary, think about using a template override. Additionally, vatcalc.dev can be used to check if VAT is being calculated properly for various types of goods.
Yeah, this happens because Magento handles grouped products differently and sometimes skips VAT logic in the list view. It's likely pulling just the base price of the lowest simple product without adjusting for tax. You might need a custom fix or module to make it behave like simple products.
