Breaking blocks like I have pings

I want play minecraft with brother (LAN server hosted by better computer, problem is same on singleplayer, read more), so I start server from computer and join through second computer. And problem is, when I destroy block, it take back and really destroy in few next seconds like I have big pings (but I have 5/5 |||||). Same problem I have on singleplayer on both computers, destroyed block get back and destroy in few seconds like I have big pings. I see this problem since 1.13-pre6.