Thank you for sending, I received the screenshot. I think what’s happening is actually not related to your screen resolution but a bug in the startup in the app where it incorrectly locks in whatever orientation you had when you started the app.
Can you try:
– Force close the app (double tap the home button to open a list of open apps, then “throw” the Mooshimeter app)
– With the iPad in portrait orientation, open the Mooshimeter app again
Let me know how it goes, sorry for the trouble