Missing diesel exhaust on RW FURX SD-40-2 7244-7286.

I have noticed missing diesel exhaust from engines a few times before, does some of the more knowable members of this forum, know what seems to cause this "error" ?.
The problem is showing up with the FURX #7244 and 7286 repaints of the SD40-2.
Somehow the exhaust seems to come from beneath the locomotives/the rails.
I have been trying to correct this without any luck.
A few pics of the actual engines.



Regards Claus
The problem is showing up with the FURX #7244 and 7286 repaints of the SD40-2.
Somehow the exhaust seems to come from beneath the locomotives/the rails.
I have been trying to correct this without any luck.
A few pics of the actual engines.




Regards Claus