[Applescript] FaceTime can not move to second monitor

Recently we tested how to move app using Applescript as below picture and find some interesting phenomenon. The following coordinates are meant for the second screen, but only FaceTime cannot be moved to the second screen. It can only be moved within its own screen, while other apps can be smoothly moved to the second screen.

Because the syntax is exactly the same, could you help to guide us what is wrong with the script?

Sincerely, Thanks, Bruce