By the way: initially I thought, that I can mine more blocks, but the counter seems to be stuck at 3066 total blocks for some reason. So, the status from the screen is not just a snapshot: the network cannot produce block number 3067 for some reason (maybe because of integer precision?).
Yeah there was an integer precision bug before I added the pre mining. If you refresh the page it should be fixed, you can pre mine the same number of blocks or more to verify (or wait, but it's the same thing).