What you were expecting to happen, and what actually happened?
Play on my Pixel C tablet (2560×1800 resolution), the screen is shifted down by about a gem’s height as seen in Screenshot_20170904-211653|690x485 (full size here) from the device but the touches are registered as though the screen is aligned at the top. This can be fixed by backgrounding the app, after which the main menu resizes to the correct size and then the battle works properly (with the background from the pre-battle team preview screen showing - but this is preferable to the previous behavior where the left and right sides of the screen were cut off.)
What are the steps to make it happen again?
Re-launch the app on a tablet with an unusually-narrow screen.
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!