TouchDown is moving a few of my meetings every week. I use an iPhone 6 with IOS 9.1, but this started on a prior version of IOS.
I average between 50 and 70 meetings per work week. I have found 2 to 5 per week that move either an hour early or an hour late, some before noon and some after. It is very challenging when I have to remember my meetings to know if TD moved them or not. Cancelling and rescheduling those meetings is not an option as they are hosted by others, and involve many participants.
At least one of my incorrect meetings is also incorrect in the same way on a colleague's instance of TD, also on an iPhone 6. She has other meetings not on my calendar that are also off by an hour.