You are mixing different coordinate systems.
get_global_mouse_position()returns Canvas Coordinates.Input.warp_mouse(curPos)accepts Screen Coordinates.
You will need to transform the coordinates from one system into the other.
See How to transform screen position to global through a Camera2D? - #2 by Sauermann and How to transform screen position to global through a Camera2D? - #3 by justinjia for documentation links that explain coordinate transforms and the Godot 2D coordinate systems.