Dynamic chart and blank entries....wierd issue....anyone know whats going on

In another post someone helped me exclude "blanks".

http://www.excelforum.com/excel-gene...ml#post2554091


when i use that formula in a defined name for plotting...........i am getting some really wierd results. i am enclosing a file for help explaining.

WHen you open the file do the following:
1) Change the named range "chrt_M_uat"
From:
OFFSET(Summary_UAT!$H$1,COUNTA(Summary_UAT!$H:$H)-1,0,-MIN(Summary_UAT!chrt_M_uat_len,COUNTA(Summary_UAT!$H:$H)-1),1)

To:
OFFSET(Summary_UAT!$H$1,SUM(COUNTIF(h:h,{"?*","<9E300"}))-1,0,-MIN(Summary_UAT!chrt_M_uat_len,SUM(COUNTIF(h:h,{"?*","<9E300"}))-1),1)


2) Next try to update the graph as follows:
click on one of the bars in the graph, then rt-click and goto select data. Then edit data for header1. Under teh series values change it from
Summary_UAT!$I$2:$I$9
to
Summary_UAT!chrt_M_uat_A

when you try to do this you get formula error. Now open up name manager and edit name "chrt_M_uat"...............its no longer the same? its somehow changed



can anyone explain it?