oh yeah that sounds like a bug. I hadn't really seen that before but if you send me screenshot or more info about it I'd really appreciate it so I can fix it!
I wish I had more details. All I can remember is that the first couple of pictures I took, it was fine and I could look at them on the camera. Then at some point after exploring the roof a bit, I noticed the buttons were no longer switching modes, and that I was still in picture-taking mode.