Why is Input.mousePosition returning wired values using Cinemachine 2D with dynamic following?

Hello everyone. I am having wired behavior with Cinemachine2D.

I have following code in my Update() Loop:

 private void Update()
 {
         if (Input.GetMouseButtonDown(0))
         {    
             Debug.Log(Input.mousePosition);                
         }
 }

I am using Cinemachine2D and on start it does follow a GameObject and it works just fine. The values look good. (Bottom left of the screen shows (0.4, 6.0, 0.0) for example)

Once I change the Following Target (another Game-Object at the same Position as the previous Object) it suddenly shows tottaly differen values (-2897.9, -1014.0, 0.0) also on the left bottom corner.

Of course that messes up all my raycasts to see if one objects has been touched...

Can anyone explain me why and how I can solve the problem, because I need to change the following target dynamically?

Thank you very much and best regards, Luke