I created a view of a SharePoint list for different activities.
The using this solutions http://spservices.codeplex.com/wikipage?title=StartWorkflow&referringTitle=Workflow I was able to allow people to sign up for the activities with only one click.
This worked great but the Activities are more than one and if user can only sign up for one item at a time.
 
Looks like the workflow start only once from the page and then cannot be started again using the above method.
I was wondering why this is happening?
Could not find any solution or the reason why this is happening?