Steps to reproduce:

1. Add this in your render loop:

std::cout << "Result is: " << std::boolalpha << ImGuizmo::IsOver() << '\n';

2. While the gizmo is visible, hover the mouse cursor around it, avoiding the actual elements that comprise the gizmo.

The following occurs:
The IsOver() function returns true, regardless if the mode is set to world space or local space, and regardless if the transform operation is set to translation or scaling.
Note: Also occurs while in rotation mode, on the inside of the gizmo, as if it's hitting the backside of the control circles.

Expected result:
It should return true only if actual elements from the gizmo are hovered.

Additional information:
Dear ImGui 1.78
OpenGL 3.3
GLFW 3.3.2
Windows 10 (64-bit) build 1903