Why did i get muted today for something i do 50 times daily ?

I am posting this message, and many other trade messages with 10 items linked, in trade 1, 2 and 820, maybe even more than 50 times a day sometimes...why did i get muted today for absolutly no reason ?

I just said WTS and linked items, nothing more, nothing less...


BTW, all the Crusader Plates, are diff items, i have more than 8. as with the shields, same, they are different items.