No clustering in clustered bar chart when secondary axis is added

Hi there,

I've got a clustered bar chart with two data series, one of which needs a much smaller scale than the other.  It looks fine as long as I don't add the secondary axis (see pic).  Note that here I've made the y-axis range so small that you can see the second series.  Displaying the full range of the first series results in the second series being invisible. Here you can't see the full range of the first series, so this won't work for my purposes.

When I add the secondary axis, I get this (see pic) and I don't see any way to avoid it.  It seems like it might be a bug.  Adjusting the overlap or the gap width doesn't help.  Anyone have any suggestions?  Thank you!!