I wanted to report a bug I got earlier. Although this bug seems to be very, very rare, I still wish to talk about it.
I got a golden cookie, and after clicking it, I started a cookie chain. However, when I clicked on the second cookie, the game told me that the cookie chain is already over...
The second cookie gave me 666 septillions, while I currently own over 10 decillions, and I'm making over 600 octillion cookies per seconds.
Maybe a recent update made this kind of bug?