Managed to change LFG description even when not commander

Can't confirm but this is probably how I did it:

1) Was in a raid squad that just finished, so commander left. So I thought of trolling and tried posting "free pizza ping 200 li" in LFG Raids section.2) But someone else took the commander tag before I posted it. So I got an error message that I can't post it if I'm not the commander.3) Later, I joined an advertisement squad selling Dhuum CM, and you can see in the picture https://i.imgur.com/pVqGHeT.jpg the original LFG post on top of the chatbox. And it immediately (automatically) changed the LFG post to the troll post I attempted to post earlier, even though there is a commander and I'm not the commander.