Global variable is not retaining value while calling from different form in forms personalization

Hi,

My goal is to get a value of an item from one form and use the value for comparison in a different form. Since the item objects are only available for that form I went for global variable. I created the global varaible in one form getting the attribute value from the item. When clicking validate to check the value of global variable it is showing 10122. Then I have called the global variable in another form. The value of global variable is showing NULL but in the previous form the global variable had a value (10122).

I have attached the screenshot for proper understanding.