But wasn't Alloy CryptoNight/CryptoNote even before? I'm mining it since some weeks with cryptonight algo... So what's the change?

I downloaded the new ver 2.2.0 and having this errore continuosly even if the balance seems to look correct:

2018-Mar-02 03:55:26.200844 WARNING CHECKPOINT FAILED FOR HEIGHT 15261. EXPECTED
HASH: 4009419ee181ef6ec47baaf7ab5bb2c5f251e0ddfd24af9eba6dfa77be01bec2, FETCHED
HASH: 1ff666c906af8e716832f49553d64ad4b9132f6603b764907f0a0b19f750f717

What to do? Does it need to be fixed in some way or should I just ignore it?
Thank you!