This sounds like connection issues in general The Mini 2 is certainly supported in the most recent version which it does look like you are using.
Using the sticks at any point during a Virtual Stick flight assumes you are trying to override the controls.
We will look at adding a message to disable the Terrain Awareness popup but the feature really is there to help people and we really want people to use it.
It looks like you are using an iPhone 6s which has an A9 processor. This might be part of the problem.