things like this happen to me frequently. the cost saving -> balanced seems to be a UI problem. when i touch the screen to scroll on the "customize page", sometimes this results in tapping the balanced/cost saving switch being toggled, and i don't notice until later.
as for peak times, etc. if you change the rate setting in the screen that calculates the "solar value" then the peak/off peak times are changed as well. that one really threw me for a loop.