Hi could be a problematic character in your listing title causing the ebay s/w to throw a wobbly, or a word inadvertantly matching a banned item e.g. a bug gun, they could zap you for the word 'gun' despite being for say a bug spray.
Either way I suggest you file a support request with Auctiva first giving them details of what the title is, they could probably identify the problem quicker and aslo respond much quicker.