Preview Pane Image Size Locked on One of Three Drives

[TWINS3T]

The preview pane images from my M: drive are smaller than my C: or E: drive - any ideas how to fix?C: and E: both resize the preview image as the pane is resized, but M: preview image starts small and disappears altogether if preview pane is resized smallerBoth views below are same size, right side shows M: drive preview image at the largest it'll go.Both files are identical, copied from E: to M: to demonstrate.

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