So I just checked in and found myself not on the upgrade list. Called and the agent told me there was a mistake applying the GUC when I booked the ticket and she helped me corrected it.
I was afraid of that and contacted the twitter team to double check on the GUC upgrade status two weeks ago and they did not find the issue. Always check in online early and check...
Not I am showing on on both Delta One and Delta Premium Select. But I am already in PS seat. Does this look right??
What's the status of your full list of GUCs in My Wallet? It is possible that one GUC already cleared you into PS and now a second one is waitlisting for D1? Possibly the "error" in how your GUC was applied was that it was listed for both classes instead of just D1 (assuming you wanted to list only for D1?)? There's no way to know which GUC(s) are being used to waitlist, but you should be able to see if one GUC is already unexpectedly closed.
All that said, none of that explains how/why you could still be on the PS upgrade list if you're already in PS, but if you did already use an upgrade to clear to PS, it might be worth double-checking so that you don't run the risk of somehow having a second upgrade burned to also keep you in PS.