Double-title on fixture types in output window

On RH4 running 3.2.1 but have seen this on older versions too, the Output window has the fixture type label printed with the name in 2 successive boxes on the screen - so for Desk Channel in the column header above the first channel numbers it says 'Desk' but then in the next column it also says 'Desk Channel' so the block is titled 'Desk Desk Channel' - this is true for all types, see pic. I can't remember which software versions, but it happened before, then cleared, and has now returned.

i77.photobucket.com/albums/j64/simon1968/IMAG0482.jpg