It is expected behavior, though probably those addresses should be labeled more descriptively. Bitcoin automatically generates one of these no-label addresses whenever you receive BTC at the address listed in the "your Bitcoin address" area. The new address replaces the old address in "your Bitcoin address" to encourage you not to re-use addresses.

It is expected behavior, though probably those addresses should be labeled more descriptively. Bitcoin automatically generates one of these no-label addresses whenever you receive BTC at the address listed in the "your Bitcoin address" area. The new address replaces the old address in "your Bitcoin address" to encourage you not to re-use addresses.

No, it's not a race.
It's simply a random event based on a Poisson distribution.

Every ~4billion times you try hashing, you have a 1 in "Network Difficulty" chance of finding a block.
At the moment, "Network Difficulty" is 16,104,807,485,529.4 and it changes about every 2 weeks.
So any estimate that says more than two weeks is also very wrong.

Thus for small pools like this (and mine) it takes a long time, on average, to find a block.