First it is not you. I have experienced this problem as well, for whatever reason the PW does not accept changes easily from android type devices. Not only do I encounter this problem with the Collections, but the same with the last page read, though with the recent updates that has improved. As to the Collections problem, I only use my PW to create and change collections, to avoid this issue. Though if memory serves with the pw, the book whose changes you are trying to implement on the pw would have to be on the pw for the changes to take place with fewer problems, but that is not 100% either. Also I think I used to duplicate it on the pw to get it to work right.
But like I said, I find it easier to just use the pw to create/change collections because although Amazon states the Cloud Collections sync across all devices, it seems they are driven by the eink device and that one it seems they all update from, even though you have made the change on one of the android-type devices. I did not get any confirmation of this from Amazon, that is just from my personal observations.
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