Half of map despawning for seemingly no reason?

[MaggeyAttackey]

Hey! So, half my map random just stops existing whenever I compile and run my map in TF2. Here's some screenshots.

I was wondering if this is a common bug or if hammer has randomly decided I don't get to have a blu side. If there's anything you need to know I'll be happy to provide.

 

[Da Spud Lord]

Can you post your compile log?

 

[Maid]

You've probably got cordon turned on by accident.
https://developer.valvesoftware.com/wiki/Hammer_Cordon_Usage

 

[MaggeyAttackey]

That was it, thank you very much!

You've probably got cordon turned on by accident.
https://developer.valvesoftware.com/wiki/Hammer_Cordon_Usage