Draco possibly the differing reset timetable is likely due to those guildmembers being somewhere on the other side of the globe. For example if they live in Oceania (Australia etc) that’s 18 hours ahead of the West Coast USA. I kind of suspect that these people can unlock newly-arrived kingdoms ‘early’ because it’s already Tuesday in their part of the world.
I wouldn’t bet on v2.x working perfectly to stabilize the reset times all the time. On other gaming networks, every time there were server upgrades (or even the twice-yearly daylight savings change) this typically caused individual member’s reset times to start diverging from the ‘official’ reset time in PST.
In the meantime the only sure-fire way to track # trophies won is to record the total trophies that everyone had at the beginning of the week. Use your own reset time as your start point for the week.