Thanks for the question. I understand you are experiencing issues with buying items from your Wish List. The following resource may help to resolve your issue:
Mac and PC
1. In the iTunes Store, click the Preview History icon and click Wish List.
2. Click the price next to the item you want to buy.
3. Type your Apple ID password and click Buy.
Note: The “price/buy” button will appear when you hover over the item in your wish list.