Single product url base adds a number to the end

I am having this problem where, when I open a single product page, the url of the main product page change. Example: My Main shop address: https://mydomain.com/products
My single product url: https://mydomain.com/products-2/single-product

If I remove that 2 from the url it gives 404 error. I want to keep my single product url like this. https://mydomain.com/products/single-product

Any suggestions are welcome.
Thanks

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