How do I identify hidden collison?

I'm making an auto run side scrolling platform game where the player bounces off the walls upon contact.

He's hitting what appears to be a hidden wall and is bouncing off. I can't for the life off me figure out what is or how to remove it.

How can I detect this wall and remove it?

Thanks

You can make the hidden item visible while debugging.

Or check in the debugger, I showed a person here.

construct.net/en/forum/construct-3/how-do-i-8/need-someone-check-codeplayer-177953

Hey man, you already asked that ?(

Thanks for your response Igor. Yes you did help me before and that was a VERY helpful reply. I'm having a harder time with this one because the player doesn't die. He just hits an invisible collision and turns around. Also most of my collisions are inconsistent with the way they interact with my character. Can you tell me how where and see how the collisions are interacting?

You can make the hidden item visible while debugging.

Or check in the debugger, I showed a person here.

https://www.construct.net/en/forum/construct-3/how-do-i-8/need-someone-check-codeplayer-177953#forumPost1094220

How did you see that number 5 was invisible again?