In Unreal: Red is Forward, blue is Up and green is Right. 
Double click that Arrow Trap static mesh and check against the coordinate gizmo in the bottom left corner:
Above, top-down view of a camera.
Whoever designed that arrow trap had a specific use in mind, exported it mindlessly, and / or the exporting software was set up incorrectly for UE4 use.
It helps but I’ll see it one way or another.
I use a free version of Gyazo - Download for this; it records 7 seconds of whatever I select on the screen, opens the browser and spits out links:
I opted for this as it takes the least number of clicks, and I do not need to store anything locally.