Reading recipes iBrew Master app

I just got the iBrew Master iPad app and was wondering why in the mash profile section there are two different temperatures for the same step in the mash profile.

read a book on all grain brewing. it will explain the steps to the n
mashing process and the reason you would use 2 or 3 different temps during the mash and the process of doing so. Palmers - how to brew is a good one.