I think that the only reason the images reappear at the end is because it has come to the end of the playback.
You see that the images are there at the beginning before you start the preview and also at the end after the preview finishes.
They will not appear at the end in any video files you create with your scribe.
You set the camera lock for certain images not certain times.
If you want to set the same camera position for multiple elements then select the elements (ctrl-click on PC or CMD click on Mac) and click on the set camera icon in the bottom right corner.