On March 21st, WotC revamped the back-end systems related to DCI numbers and planeswalker points (link). I know that one of the side-effects is that TOs can't do DCI-number lookups by name anymore, so that must mean player names are no longer connected to DCI numbers in the same way they used to be. My own PWP page shows the same thing as yours. No opponent names after 03/21.
Asked a friend and has the same problem
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