so far i can tell these three either dont pay MN fees or pay less then required or run unknown masternode versions as of late :


XxDotRpSDzgyAkx3jHkLZD8YYZRwbcjmmA : getting unpaid blocks with unknown masternode version
XkETHbymbZgkpjHG3f4Ad8osWg3XkPta5L : paying 20% with masternode version 0.11.1.19+
coinminepl : paying the required 37.5% with unknown masternode version (coinminepl's records are a bit weird.. sometimes it shows 0.11.1.19+ and other times it show masternode version unknown)