Is there problem with/ or explorer/pools?

According to block explorer, last block is 8819 Sat, 13 Jan 2018 02:35:56 GMT

Yet, if we look to sgl.suprnova.cc
Last Block Found   8,818

And http://www.sigilmining.com
Next Network Block   8,971    (Current: 8,970)
Last Block Found   8,968