FYI.....its very important to know that using the airbnb app does limit you, so you will need to use a desk top, or laptop or Mac Notebook in order to use the Special Offer feature. Also, if you do run into this same issue on your computer, then declined the guests (write them first of course) . I did this for several guests. Then I was able to use the Special Offer feature to send them an offer they couldn't refuse. Try that. It works for me everytime. Good Luck.
If you feel that me or another host have helped you, feel free to click on the "thumbs up" button at the end of any post. Thank you so much.
Aloha, Momi
Great way to contact Airbnb or via Twitter at AirbnbHelp / Facebook