>… am I doing something wrong…
I doubt it.
However, this would be very difficult to track down without having an exact setup of your site .
Is there a way you could let me have a duplicator package to download somewhere ? (I assume you know what I am referring to here but if you need clarification, please let me know)

At a guess, I would think you are getting a notification for an item that does not exist anymore / has been changed / or similar, but without being able to look at this in detail with your setup it really is just a guess ….

(if you provide a link here to an duplicator package, make sure you set your post to private – alternatively simply send an email to dev[AT]wp-pizza.com with this topic title as a subject. thanks)

Not sure what you mean by “reusing the menu items”

However, just changing titles would not make any difference. All it does is that this renamed item will still have the same stocklevel as it was before – unless it gets reset at the same time – but when you get a notification it will simply use this new name in the notifications

I do not think this is the issue you are having (but it does kind of depend on what you mean exactly by “reusing the menu items”)