That is very strange! I don't think I've had a bridge curl upwards towards the nozzle before.

Assuming you have the makerfarm supplied extruder fan, one thing I might try is to reverse the direction of the fan by unscrewing it and flipping it. My thought is that if your fan is blowing from the front of the extruder to the back of the x carriage, a small amount of air could be leaking down on to the print. I know this happens because if I have my extruder in the middle of the bed with the fan on, the bed will not heat up since the air is cooling the glass. Try flipping the fan so that the air pulls from behind the extruder and exhausts out the front of the printer.