The person is asking why you can change it to a completely different product that’s in a different category. Like changing a listing for socks to a listing for a monitor stand.
There were cases were Amazon's own product pages were hijacked like that in the past...
Try browsing through your oldest Amazon orders--you may very well see something you didn't buy at those links now.
If you don't, how do you fix a listing error?
This feature exists on Amazon, Etsy, eBay, etc.