The Calculation Clears On Screen Rotation

Expected behavior

The medical calculations should retain as it is on the potrait mode when rotating the screen.

Actual behavior

The medical calculations clears on screen rotation and you have to recalculate the items.

How to reproduce

1. Install the app from F-Droid.
   
2. Click on Calculators and then select Creatitine Calculations. (You can select other items as well)
   
3. Now enter the details and click on calculate. The app will now show the calculation.
   
4. Now change the orientation of the screen to landdcape mode.
   
   The calculations are cleared on screen rotation.
   

• App Version: 2.1.6
  
• Device: Samsung Galaxy J5
  
• Operating System: Android 6.0.1

Recording Of The Bug