Hi Walspec,
How are you entering the value? If you are using a normal table, please check your Data->Show Fields has a repeating group tied to that table. A repeating group will have a blue icon on the group node. If that's correct maybe you are setting the value using a rule. If so, that sets all rows in the table. To get around that, you need to filter the set. You can use default values to do this. Double click on the target field in the Fields task pane and click on Fx and enter a field with a filter. You can also set it using a rule by manually editing the manifest.xsf file and adding square brackets with the index to the row, for example "my:row[my:index]\my:column1". To get at the manifest.xsf to modify the rule, click File->Publish. Go to Export Source Files. Close your InfoPAth Designer and open the manifest.xsf in notepad. Scroll down to the bottom and find the rule that is broke and manually modify it. Save and close. Now right click the manifest.xsf and choose Design and preview/save.