Noclip Issue - Editing Questions - Doomworld

So, I was creating a new battle for my slaughtermap, but then I encountered a critical error: when I pass through a certain part of my map (which I dont know specifically), I noclip through some walls (not all of them), and I am unable to activate Walk Over triggers.

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Bring Your Own Class by revenatn, Redead-ITA, Basinga, Darthlother, fesh, Combine_Kegan, Silvercide, Kray0la