Block sequence violated between blocks 1505819 and 1505821?
Three consecutive PoW blocks within 7 minutes.
EDIT: Curiously enough, in CryptoID, block 1505820 said "age: just now" until 1505819 was 10 minutes old... 1505821 still says "just now" despite being visible for some minutes already. Could someone have compiled a hacked version of the wallet in order to mine blocks with future dates or something, bypassing block sequence validation by the network?
Just check how block 1505822 (or even PoW 1505824) is several minutes older than 1505821...

EDIT2: yup, now block 1505821 says 1 minute old when 1505820 is already 11 minutes old...