UDK - Very weird issue, causing problems with brushes

[Pejnozord]

Hi there guys,
I am currently working on my University project and I have encountered very weird issue, its like invisible "removing" brush hidden inside my map that is disallowing me to create brushes at this certain cooridinates. I want to connect two paths using Cube brush. However everytime I try that it just cuts off part of my brush. It seems like this line is infinite, has any1 got any ideas what could be wrong, or what have I done wrong?

I have attached two screenshots below, visually representing the problem.

Any help would be very appreciated,
Thank you.

[Pejnozord]

Hi again, with a help from my tutor, I have figured out what was wrong with this bug, here is solution for anyone who encountered this issue before:

The problem that occurred was related to Brushes and their polygons, in my case and Im sure in most cases that was the problem , so here is what u need to do.

1 ) First of u need to locate brushes that have non-coplanar polygons ( you'll realise which one they are after building your map )
2 ) Then you need to double click them (so it takes you to this particular brush )
3 ) Select the brush
4 ) Open Geometry Mode
5 ) In Modifiers section Click - > Triangulate


Here is my re-build map log .