Sometimes when you're trying to edit on your phone's browser, it doesn't open up correctly.
So I always use the app or my pc. Whenver you're editing, make sure you do this
1. Select all control+A on computer
2. Copy it and past in Google docs.
That way it anything screws up, you'll have a copy saved in Gdocs.
Keep only one device/platform for editing purpose. Either the app or the computer website. If you do this, you'll definitely have no problems.