Hi @Airbear, I think as @ASperry said, Domo Support will be best placed to explain why the cards were changed.

However, in terms of what the optional group by does; if your Warehouse column conatins a distinct list, i.e the column in the dataset has no duplicates, then you wouldn't need the Group by in the filter card. If it has duplicate values, which I expect it is likely to do, then the Group by will show only a list of the unique warehouse values in the filter.