MAP MAKER COORDINATE ERROR!!!!!!

I started making a map with the tools provided at the top of this Forum. I noticed that the X,Y coordinates never lined up to the actual pixel of the jpg. Most of the posts just said you need to mess with the XML for an hour or so to fix it. Well I decided to find out how much the X,Y coordinates were mismatched. I found that the Large map a pixel location of (0,0) really gave (4,-20) and that (100,100) was really (104,80) Here is a pick of the quick grid map and the output from the map checker on this site.
If you want to run the map checker yourself the jpg and xml are also here
JPG
http://jmhooton.iweb.bsu.edu/joel/test%20grid.L.jpg
XML
http://jmhooton.iweb.bsu.edu/joel/testgrid.xml
So basically you subtract 4 from your X pixel number and add 20 to your Y pixel number.
Let me know if anyone finds this helpful.
Joel

If you want to run the map checker yourself the jpg and xml are also here
JPG
http://jmhooton.iweb.bsu.edu/joel/test%20grid.L.jpg
XML
http://jmhooton.iweb.bsu.edu/joel/testgrid.xml
So basically you subtract 4 from your X pixel number and add 20 to your Y pixel number.
Let me know if anyone finds this helpful.
Joel