The display layout is not stable. It will change what data is being displayed in the individual cells at various times. For example, today I stopped for lunch without turning my Edge Explore 2 off. 60 minutes later I found that two of the display cells which had been showing the ride time and the average speed respectively were both showing "Timer" each with a different value!.
On at least one occasion the display layout has changed between switching the device off and switching it on again.
How do I stop this happening?