Why do the external parameters in stereo calibration differ between the 'visual values' and the 'output T value of PoseCamera2'?

Currently, I am using two cameras to capture images of a checkerboard and performing stereo calibration to obtain external parameters. The results are shown in the attached image. Since the heights of the two cameras are almost the same, this image shows the x-axis and z-axis to highlight the current issue. The current issure is that the values on the x and z axes differ between the visual values in the image and the output PoseCamera2's 'T' values.

Specifically, the values in the image are: about[-1300, 150, 1000] while the PoseCamera2's T = [1706, 81.48, 363].

When measured with a tape measure, the actual distance between the two cameras almost matches the values in the image. I would like to understand why the visually output results differ from the PoseCamera2 data results.