Keying issue

Hi guys!
Herę came the day when I have the issue that happens sometimes and until this day I have never dig for the solution. Until now because this is so annoying. Why 3D Keyer gives me such result?
Example 1
[img] [/img]
Example 2
[img] [/img]
instead of the right effect?
[img] [/img]
I am wondering what causes this as the set, camera and environment are exactly the same every time we record session and usually there are no problems.
Herę came the day when I have the issue that happens sometimes and until this day I have never dig for the solution. Until now because this is so annoying. Why 3D Keyer gives me such result?
Example 1
[img] [/img]
Example 2
[img] [/img]
instead of the right effect?
[img] [/img]
I am wondering what causes this as the set, camera and environment are exactly the same every time we record session and usually there are no problems.