I think altcoinix is involved. He occupies more than 51% of the hashrate, the generated blocks are returned to his wallet but are not divided by no share.
Block   Finder   Time   Actual                  Shares
769953   unknown   08/12/2018 04:57:20    0
769952   unknown   08/12/2018 04:56:06    0
His wallet: http://block.withcoin.biz:3001/address/wd6uGCJvaqCmTsc9QEFo8rpQet4evrDz1F