When i use Zedi Go on IOS (iphone) and select a sensor to pull up the graph, when i click back to go to the previous screen the

When i use Zedi Go on IOS (iphone) and select a sensor to pull up the graph, when i click back to go to the previous screen the phone gets locked in portrait mode and i have to use the phone sideways and the only way to fix it is to home screen and close the app. Ive checked all of my phone settings and they are set correctly. My android phone doesnt have this problem. Not sure if its a bug.