Frames with detected checkerboard corners not included in Frames calibrated

I’m performing a checkerboard light camera calibration with three views (left, middle, and right) using XMALab 1.5.5 on MacOS Mojave 10.14.6. I have 39 checkerboard frames. I detected the corners (in some cases using manual input) for the following number of frames in each view (see attached ‘Frames not included.zip’, which includes the XMA file plus 3 frames for each view from our marker tracking frame set):

Left: 23 of 39
Middle: 30 of 39
Right: 28 of 39

And there are 15 frames in which the corners have been detected in all views.

The bug is that the number of “Frames calibrated” does not match the number of frames in which the checkerboard corners were detected for all the views. For the left and right views, not all of the frames in which I detected the corners are included in the “Frames calibrated” (see screenshot 1); for the middle view these numbers do match. The number of frames included in the “Frames calibrated” for each view are:

Left: 2 of 39 (vs 23)
Middle: 30 of 39
Right: 10 of 39 (vs 28)

Also, for those frames that are not included in the calibration there are other issues visible in the information panel and in the projections of the crosshairs and corner numbers onto the image:

In some cases there are no crosshairs at the corners but there are red corner #s projected in the wrong positions (see screenshot 2)
In some cases the red crosshairs and green corner #s are both in the wrong place (see screenshot 3)
In some cases the red crosshairs are at the correct positions but the green corner #s are not (see screenshot 4)
There is no error after “Error distorted (current frame)” or “Error undistorted (current frame)” in the information drop-down panel for all affected frames (see screenshots 2-4)

There are also some frames where the red crosshairs and green corner numbers are projected properly (see screenshot 5).

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