Export problem, Audio Mixdown

Hello I have a small problem with Export Export problem, Audio Mixdown. In mpc software I have a sequence of 8 bars, when I select ", Audio Mixdown explode tracks" my export file made 7 bars. Why do I miss 1 bars? If I select "separate programs" my final file and well 8 bars. How do I solve my problem? https://images.weserv.nl/?url=www.casimages.com/i/170322031638401084.jpg.html

I would try inserting a blank bar in the beginning