Lots of barriers make blocks dissapear

I have built an arena.

For PVP, I used lots of barriers to stop TNT explosions from exploding outside the battle area.

Any person at one side of the arena sees glitches on the other side.

 

Video

https://drive.google.com/file/d/1hE9-zgfZNDKvDlQLkuqLBQX2Tb72LhJZ/view?usp=sharing

They may still be processing the video.