Error while saving a common variable.

Hi everyone,

I'm changing a worlflow, this workflow has only one action that is "Call web service".

When I click in configure in this action the modal opens Ok.

 http://i.imgur.com/VbYLaYn.png

But when I save an error occour and when I open the modal again, all variables has been replaced by the code in HTML.

 http://i.imgur.com/nH9hLRd.png

 I already try export this workflow and import again, and export a identically workflow and import in this site.

Anyone can say me how I can resolve this and continue editing this workflow?