Offer already made- but I withdrew it

Offer already made- but I withdrew it

I made an offer letter, but made a mistake on it. I withdrew the offer but now I can't recreate the correct offer. Zoho keeps saying that "A same offer has already been made".
I look in the "offers" and there are NO offers (this is the first time I've tried this function).
I've tried moving the candidate back a stage but nothing works. 
This feels like a bug - how can I tell recruit that there is no prior offer !?! 

thanks,
John.