Exporting from timeline only half of a double show

I'm trying to export last year's classes as a full timeline but every time I do only P1 of the double shows up.

One of my colleagues is having a similar issue but with only one of her classes. The others all show p1 and p2 separately. Her classes are set up the same. The one that won't work she carried into 14/15 from 13/14 and the ones that DO work are all August 14 set-up. All of mine are Aug 14 set-up so we're thoroughly confused as to the reason some work and some not.

Anyone got a fix?
Thanks

Hi,
Open the class that is causing trouble, diary view (day or week) tap on three dots (top bar right)
and make sure the week 'days depend on calendar', it is now probably set to'simple week' instead