This has also affected the GW results page as well. All the individual match records are blank but each person’s totals appear to be intact. Totals seem to also be accurate for schedule & rank pages.
I had finished 2 GW matches before o became aware of it then finished the other 3 with no incident but the results still remained blank even though all the various totals updated properly.
My event is showing as completed still, I know others are having issues though. Hopefully you will be able to claim it properly after they fix it. Guild wars roster, events, pretty much everything seems to be having issues!
My wife just experienced this issue again after a restart fixed it the first time. At the same time her event gem total showed as zero for a while as well.
There is a case where guild interactions will sometimes cause the roster to 0 out again, in these cases just backing out of the guild menu and re-entering it should fix the roster again.