Report with two columns always displays column header on first page regardless of group change condition

[smithlee]

I have created a report in Studio (5.6.0) which I have split into two columns. I have a column header band with a condition to print on a group change. The report works fine apart from the first page which always prints the column header in both columns regardless of the group change condition. Has anyone else come across this before? Am I missing a condition somewhere else? Many thanks.