Every time I reload the game, I appear above ground.

Whether I have dug a cave or entered into one already there, if I am underground at all when I exit the game, when I reload I reappear above ground, which means I sometimes have to climb down a mountain to get back to where I was - if I even can. I've encountered this sort of thing infrequently before, but this is happening every time as of 11.1, and I even tried reloading the app, but still got the same thing. The only time that hasn't happened, I was underground, but in open space and not behind a door...but I don't know what I did right so that I didn't reappear above ground.