Order details show same product twice

Hello,

I received orders that have the same product “A” shown twice. I tried to replicate the problem on my end and figured out the following: If I add product A on the product page, it is added to my cart page. If I add product A on the category page, it is added to my cart page like a different product. Normally, the amount will be added but on my side, product A will be added in addition to the first product A even though they are the same product i.e. same article number and they also have the same product page on my backend. Product A will also be added in addition to the other product A if I add the product on the search page to the cart.

Looking forward to your reply and help!