Film curling the wrong way

[_T_]

Normally when I process my 35mm color film it tends to curl towards the emulsion as it dries, but I've had a couple different rolls that are curled significantly in the wrong direction, away from the emulsion. One Ektar and one Portra. I haven't changed anything about my chemistry or the way that I process the film. The one thing I'm guessing it could be is a difference in ambient temperature? It has been significantly warmer in the room in which I'm processing the film lately.

Does anybody have any idea what it might be?

 

[Sirius Glass]

Hang the film in the bathroom with a steamy shower and that should relax the curl.

 

[_T_]

They actually end up perfectly flat after sitting in my print files for a couple hours. I just thought it was weird. I kept checking the negative to see which side had the emulsion. Do you know why they might be curling backwards? I've never seen that before.

 

[MattKing]

Film curls because one side dries at a different rate than the other. Changes in ambient temperature and humidity during the drying stage can have a large effect on that.