It happened to my warlock, It said the name of 3 players just came online and I saw the guild message of the day.
Thing is my warlock is not in any guild…
Blizzard corrupted something?
It happeneda after this weeks reset.
I just had this happen, too. First message was “Your guild has moved to a new realm! Please visit [this web page] for more information.” That got me scratching my head because this guild in inactive with only me in in these days, then shortly after there was another message followed by a random demon hunter earning two achievements (who was also in a different guild)
If I didn’t know better I’d think it was an April fools joke or something
Same thing just happened to me. Guild message was different. But then checked to see it was actual set to the normal. I was only player online in the guild. Then get random player name has gone offline. Looked them up to see they are in a totally different guild on another server. Similar to what everyone else is saying. Something is def broken.
I just had this happen to me as well. This toon is a bank toon, GM of a bank guild. Only one other toon in the guild, an alt of mine.
GMotD popped up saying “All tabs in Guild with “?” are open to members. Blue tab is for Guild Master only”. I checked my GMotD and it’s blank (which is normal). Also had a random player name go offline, just like Yae.
Very strange!
I’ve had both the “You are not in a guild” message and a different guild’s Message of the Day display upon logging in. My guild membership remains correct despite the incorrect messages I receive.
I’ve noticed it only happens when I play a game of Plunderstorm, then go back to my World of Warcraft character page and log on a toon without closing the WoW client.
Plunderstorm seems to be a common denominator here. My friend was having the same issue while I was reading this thread and I just asked Were you in Plunder. She confirmed she was.
I see several people here making a note that they came into game after plunder. Others should check this as well.
It definitely seems to be Plunderstorm. I’ve been getting this for a couple of days randomly. I’ve noticed it only happens when I log in, play plunderstorm, then switch to wow retail and log into a character. It has yet to happen to friends who don’t touch plunderstorm.
Friends don’t let friends play Plunderstorm. 
But really, in the current implementation, running Plunderstorm seems to do terrible things to your Retail WoW UI, every single time. The devs need to reimplement the Plunderstorm UI completely independent of Retail or it will never get better.
plunderstorm seems to have goofed up alot of things. I’ve gotten them twice on different toons. one of the had someones bnet tag in the message
Been noticing it too, started on 4/1… I’m ranked just under the Guild lead (Guild lead is my fiancée, and hasn’t been on due to waiting for eye surgery. IDK what would have done it, since She’s the only one who’s allowed to change it, as far as I know.
Still happening! So odd.
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Seems I’m not alone experiencing this issue. My guild MOTD was changed also by someone who was not in guild about 15 minutes ago. This has now happened twice to me, previously a couple weeks ago. I am the GM of my guild. It doesn’t seem to actually change the MOTD, it just shows up as a new message in guild chat. Yes, this happened right after I logged off Plunderstorm and onto retail. Interesting bug.
Oddly, I hadn’t actually tried Plunderstorm yet when I first saw this behavior (though I have since.)
I haven’t seen it personally since, but a guild member of mine (who has been in our guild on that toon since 2009, so probably not bleed over from an ex-guild) got it this morning. He’d just changed the message to wish someone a happy birthday and was very affronted that someone else had immediately changed it again, but, of course, no one had.
I’m not even in a guild and am getting spammed with three or four random ones at login. Some even have their private discord info!
Probably not. Your own MOTD is probably unaffected; the actual effect being reported is that people are being shown other guilds’ MOTDs. Even folks who aren’t in a guild are being treated to random guild messages.
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Yup - it’s deffo not MY guild - I was getting a bunch today when changing toons. It’s creepy lol