About instances of a screen page

My pages in flutter, for example HomePage, it seems there are more than one instance of it. I wonder if it is right to have only one instance? How to enforce that?
Also, for some reason, when one widget of a page get focus, all pages are rebuild. For example, go to Homepage and go to PurchasePage and Homepage then OrderPage, when a TextField in the OrderPage get focus, all HomePage(Two of it), PurchasePage and OrderPage are rebuild. I wonder what could cause that?

Thanks

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Is there any value that you are updating on TextField Focus on OrderPage that in any way is affects the Homepage? For example ScopedModelDescendents’ notifylisteners() method that would be getting called due to which all listeners are being rebuilt?