[This may be a duplication of a post I thought I'd made earlier, but I haven't been able to find it, so maybe it didn't get posted. Apologies for any confusion.]
I am setting up a responsive form for a tablet and am confused about how it orients the fields in landscape vs. portrait mode. The form is using 12 columns to give me more flexibility in how I size the data cards.
In landscape mode, the data cards break as shown below.

In portrait mode, the fields are arranged like this:

I expected the landscape mode to basically do what the portrait mode does, which is fill up the row with data cards and then break to a new row that also fills with data cards.
I'm not sure what I'm missing so any help is appreciated.