In Connect when viewing the walk/run workout - and selecting 'interval' tab, the type is listed as 'run' or 'cool down'. Since it was actually 'walk' for half the intervals - I would expect it to display as 'walk'. I would also want to view stats filtered by run only intervals, rather than only the workout as a whole.
Is it behaviour as 'designed' by showing 'run' for each interval type (other than cool down)?