Thank you!
That should not happen! I tested it myself and didn't get any issues. Mines should just be getting more with each layer. I'm playing in Chrome browser, maybe that's it? If not you can try the Download version.
My wife and me played only web-latest chrome version already.
We get two full freezes as I describer above and many just an empty levels in middle of game, and an empty levels don't reveal top layers at all. (May be, break top revealing to next levels, but i am not sure) Me be it's give You some clues...