For US players, it may be difficult to respect the time line of GMT time zone. Are you sure that is wasn't a player's slip-up?
Every once in a while, there appears to be a glitch with the system recognizing a practice round. For example, the other day, I played a couple of practice rounds (shortly after 8:00 p.m.; EDT, which is my time zone).
While it appeared to recognize the day for CPD on my iPad, when I logged on to the flash version, the CDP for that day had a red exclamation point indicating a round had not been played. So, I played a 1-hole practice on the flash version and then got the green check mark.
I've seen that situation happen before.