Embedded images shrink in Chart area when printing

I am having trouble pasting a small jpg image in the chart area of my charts.
The image looks fine on screen but when I print preview or print, the image
is SOMETIMES squashed. This occurs if I print the worksheet or the chart.
I have a worksheet with say three charts, the squished image issue is
intermittent on all three charts. This is occuring with no change in the data
feeding the charts, no change in row or chart area heights. Is there any
support for this?

The first question someone may ask is how I paste the image. I am selecting
the chart area, then pasting the image. This way the image is part of the
chart not the worksheet.

Thanks