Why does my particle system block a trigger volume?

Hello, everyone! I’m a total noob here, so I’m struggling to make it all work.
I have a particle system of a lightning/fantasy portal, which is triggered when a player enters certain area. According to my plan, the player approaches this lightning and has to be moved to another level. I have a trigger volume at that loaction for that, But here’s the problem. In case the player doesn’t trigger this lightning (portal), but just hits the trigger volume which opens another level, the player does find himself in another level. And when the lightning IS triggered, the scheme that opens another level stops working. Moreover, I moved the lightning to various places on the scene - it doesn’t matter where it is. If the portal appears, you can’t move to another level. What is it? How can I fix it?