Chart Series Using a Named Range Stays with Old Worksheet when Worksheet Copied

Hi,

I have a dynamic chart defined using named ranges. For example I have the following data series:

=SERIES('Sheet 1'!$A$1,'Sheet 1'!Name1,'Sheet 1'!Name2)

What I want to do is copy the worksheet and have the named ranges change scope to the new worksheet:

=SERIES('Sheet 2'!$A$1,'Sheet 2'!Name1,'Sheet 2'!Name2)

but what happens is that the ranges stay within the old worksheet's scope:

=SERIES('Sheet 2'!$A$1,'Sheet 1'!Name1,'Sheet 1'!Name2)

Any thoughts on what I might be doing wrong? I've gone into the name manager and verified that the named ranges actually copied over and exist with the proper scope, the chart just doesn't seem to be smart enough to use the new ranges...

Thanks for any advice.