Trigger visable ingame

[Svettiga Kent]

Hello. I have a weird problem with my hammer editor. When i place a trigger brush it becomes visible when i test the map. If i load another map it works as it should and is invisible but if i add a new trigger brush to a working map the new brush becomes visible as well but not the old one. Can anyone please help me?

[bundestrojaner]

Have you set it to a "trigger_once"? If you have try changing the textures to invisible

[Wazanator]

Are you setting up the trigger correctly?