Does Playstation Stars just not work half the time?
Honestly I forget that the Stars program is a thing most of the time. But every once in awhile I'll check out the Campaigns you can do for Collectibles. Usually I'll be auto registered or I'll manually register if it's something I'll be completing anyways, but half of the time it doesn't actually complete.
For example, right now there's a Spider-Man trophy that auto registers and only requires that you play a game, any game. Well, it still shows incomplete.
I find similar. To be honest it's not that great value anyway - I just treat it as bonus rewards every now and again if and when it does work. I think maybe I've received $16 in rewards since the start which I wouldn't have normally, so can't really complain. But definitely buggy.
When you're in the Stars screen there are 3 options. The middle one "Rewards" tells you what games you can buy with your points or just convert it to money on your account and buy what you want. I have about $10 worth of points.
Tbh, I haven't investigated it much to know one way or the other. I'm just sitting back, accumulating points. Down the line I'll probably take a look and see a bunch of stuff, but for now I'm just letting them silently accrue