Why is my picture displayed upside down?

I have a website where the content of its web pages are displayed based upon database table row contents.  Each row of the table defines the size, alignment, appearance and color.  For text, the row provides a link to another table of text and for pictures, it provides the name of a picture file that is stored in a sub-directory of images.  New controls are created at run time for each row of content information.  Everything worked fine until I inserted a new picture that is displayed upside down.  I verified that the database table contents are correct and that the picture file exists at the proper location.  When I display the picture file with other software, it looks fine.  Other pictures on the web page appear properly except for this one new image.  How is it possible for a jpg picture file to be displayed upside down on a web page?  Please help.
Maurice