Can't see that there is anything you can do if ebay will not explain.
Do you send a lot of messages? Sometimes the robots who monitor messages pick up words that do not exist, for example last letters of one word and first letters of next word make up a word that was not intended.
That is the only thing I can think of, if you regularly use the same words in questions there could be something that has been picked up. Just as an example I wasnot allowed to list a religious badge because the moronic bots objected th the words on the small badge "Gods word". They made up SWORD and this little badge was a lethal weapon.
Have a look at any messages you have sent to see if here is anything that could by accident make a rude word.
