Check_labels result 1 pixel off in Y-axis

When using check_labels the resulting images seem to have the markers one pixel too low and there is a white line at the bottom of the image. This happens with both externally labeled frames and frames labeled in DLC.

In the attached image, all points were labeled on the horizontal dashed line but when I use check_labels, the markers end up one pixel lower and there is a one pixel high white stripe on the bottom of the image.