Do you use peakd? I get duplicate and triplicate pings on there all the time. clear notifications, they come right back on the next refresh. Not the best JS in there perhaps.
But if the message got through, then that was the goal, and perhaps you'll take this chance to make a post to pass it on to your voters, so they can be aware that their energy can be redirected to functional witnesses. Most users don't check the witness pages that show downed witnesses, only the ones in the voting page on whatever blog UI they use. And further most of them don't look at that very often or at all after they place or proxy their votes the first time.
You're the only person I've heard back from on the list, so at least its good to know you didn't get hit by a bus!