Build to Top/Tower Round

I joined the server and the players showed me a glitch that they were all standing on nothing? Not really sure what caused it but here is the screenshot I got of it. I did slay the people who were glitched.

Spoiler

 

They are not standing on nothing, it is the gravestone prop. The backside turns invisible for no reason, and that is why it makes it look like he is standing on nothing.

 

I believe I've seen this once before in the past, it was not in tower round though. It may be a glitch in the map.

 

Actually you are wrong, they told me they were standing on nothing.

 

Well the backside of the gravestone is still invisible.

 

Not the gravestone prop. They wouldn't have the pose they currently have in the image if they were just standing on a prop.

 

I believe its similar to the wall in jb_newsummer_v2 where you can pass through. I will check it out later in single player.