It seems, that the multi-row card works currently only with even number of items. I am using latest version (2.37.4464.461).
If there is an odd number of items, the last one is shown on top of the card, with bigger font and without category label.
With even number of items, it works OK.
I tested this with 1-6 items, adding more items to the same multi-row card.
With previous versions I have not witnessed such behaviour.
Does the multi-row card work for other users (with July 2016 update)?