Upvote:1
I would personally use the first option (list HK twice), as you did edit and re-enter Hong Kong twice (you probably have stamps for all those entries and exits in your passport, donβt you?).
As for the dates, this seems to be a bug or at least an oversight on their part, it does not even allow the use of the same date for transit.
You should probably contact them using the βContact Usβ link at the bottom of the page to point out the issue and ask for guidance.
Let us know what they tell you!