Not exactly sure what happened. From my experience, once you enter you can play your 1st round. I don't think the clock starts on the 24 hour window until all 16 have entered.
Then you have an entire day to play round 1. Round 2 starts after those 24 hours. Now you will have 24 more hours to complete round 2. You can play it right away, many do, but round 3 if you are still playing is 24 hours away.
No idea why you had a WD unless the time expired. If you don't play in the 24-hour window for the round you would get a WD. I am sure others with more knowledge will respond. Best of luck.
DC