It looks like you have got both the start and end date set to the 16th May...
If I remember correctly, I coded the countdown to use todays date if the start date was not valid (either missing, or later than the end date)...
You need to change the Start date property in the url for the countdown image... For example, if you want the countdown to start from 1st January and end on the 16th May, you would need the following:
And the result would be this:
I suspect that is more to your liking... if you ask nicely i am sure a local signature fairy could help if necessary :)