Hello so as you can see from the picture I am getting this strange glitch on my server it's only in this world. I think it's a world edit glitch or it could even be miltiverse or PlotMe It started to occur after I did /gmask Is there anyone who can help?
Are you the only one able to see it? Is it a resource pack issue? A little more info would be helpful.
It might just be a client glitch then. Try restarting the server/client to see of that works. If not, try standing where the glitch is, does it push you back out? If it does, then it's invisible blocks not properly deleted from the world.