I wrote about that in an earlier post in this thread, what happens is, nomatter what the cPath, as long as the product ID is the same, it'll show that product, the cPath decides what category is shown along with the product, so, by changing the cPath, the product is shown in a category that it's not supposed to be in.
I'll try and explain with example.
The numbers in the cPath variable tell the system what category to show.
"6" is "Coffee, Tea & Chocolate"
"19" is "Loose Tea Blends"
19 is a subcategory of 6, so "6_19" tells the system to show an opened "Coffee, Tea & Chocolate -> Loose Tea Blends"
Just "19" shows only "Loose Tea Blends", without "Coffee, Tea & Chocolate".
Functionally, this doesn't pose a problem, but the dual content issue isn't fixed, it's replaced with a different dual content issue.
First you had duplicates with a link with and without a cPath.
Now you have two different cPath links, one correct and one incomplete.
How the incomplete one got there I have no idea
I hope you understand what I'm trying to say, I had a bit of difficulty putting it into words ;)
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