3D Camera Tracker "Create Text and Camera" changes video perspective instead of adding tracked text

Hi Everyone
I just started using After Effects and have a problem with the 3D Camera Tracker. I want to add a text to my video, but when I choose right click --> "Create Text and Camera", my whole video changes the perspective as can be seen on the Screenshot below and moves around weirdly, as if the video would be tracked to the video itself. In all the tutorials I have watched, at that point the text would be added to the video.
What am I doing wrong?
Thanks for your help.
