I already emailed to Axure support team about this issue.
“Thank you for writing in! I’ve tested out this global variable behavior in our second most recent stable build (3675), and compared it to the behavior with the latest build (3679), and I was able to reproduce some different behavior as well. The latest build included some changes to the “Open Link in New Window/Tab” action, so that the prototype player is included in the newly opened window, so that player features like notes and comments can be accessed. This change creates a new instance of the project, so that global variables do not pass between the two opened project pages. While this behavior is expected in this case, I’ve filed a feature request regarding this global variable functionality with our respective teams to review on your behalf.”
So, I am waiting for the bug to be fixed. I hope it’s resolved quickly.