Ah, ok, Yes - but you can get it bigger by making your browser window smaller so that you can post more information in the screenshot. It’s ok. I think I see what is happening.
What you were expecting, I think, is that the drop-down would populate from the information that you entered for the drop-down in Key A, is that correct?
But that isn’t what happens. The way this works is that you’ll create a lot of entries, and in the process, populate information in KeyA. KeyB will then supply a drop-down of all the information in that custom field from your previous entries.
So if you go create an entry and fill in KeyA - that information will show up, after you submit of course, in KeyB.
If you want both dropdowns to share the same options, you need to just copy and paste them over, though in the long-run, you might be better off looking at Relationships =)
Make sense?