show records dupe column

I've made some simple reports and when I right click and select Show Records, the data displays, but one column is listed 

twice.

https://www.dropbox.com/s/ohkjfg2lx70p17t/Dupe_Col.JPG?dl=0

I've tried all sorts of things to get rid of the second, but it persists.  It exists only once in my source dataset.

Anyone seen this before - or have an idea how to cure it?

Thanks