If your browsing the site on a mobile device (cell phone) as i usually am, buds mobile sight tends to have technical issues. What I do to make sure I get the notification with an out of stock item, is i hit the Notify me button and give it about 3 seconds then I refresh the page, now when the page reloads the button that previously said "Notify me when in stock" now says "remove Notification" that means that you've signed up for an alert, if this still doesn't work try clearing your history ( buds site uses alot of cookies and it can cause issues with mobile devices) then reload the page try again. You can also try using a different browser or device (PC. Laptop)
as for the wish list the site caps the total number of items in your wishlist to 20 items, if you have less then 20 in your wishlist, then try all my previous steps.
If you have 20 items you'll need to remove one or more from the wishlist.
If none of that works ( one of those steps should work) you can always try speaking with customer service to see if they can add the item to your notify list
Call buds during buissnes hours at 859-368-0371, 9am-9pm eastern Mon-Fri
Or use the Blue Chat now button at the bottom right corner 9am to 9pm Mon - Sat and closed Sunday

Also you can go to the tab at the top of the screen that says "order status/account notification" click that then half way down the page is a button that says "Review product back in stock notifications" click that and it will show you all the items you have alerts set for
budsgunshop.com/account_notifications.php