Frode,
Instead of using the Unique Count formula, you'd could do the following:
1. Create a Count column (="1")
This way when you filter on product A it will show 1 for each record and add up to 2 and if you look at the total row count it would show 3.
If you wanted to do Product count to get 2 (since there are only two records) you could do the following:
2. Create a Repeats column: Do a SumIf(Product,Product,Count)
3. Create a Total count column. Total count = Count/Repeats
Cheers,
Ryan