Line Loop on SQL Report where the data is grouped

Hello, 

I've got an issue with a line loop macro on a SQL report that has the first column grouped. It appears to be multiplying the numbers of rows by the number of grouped levels.

e.g. If there are five records in the list, but the first column is grouped rather than looping through 5 rows, it loops through 10 rows.

I hope that makes sense.

Thanks 

Oliver