Well, if your temperature is fluctuating that's going to have an effect on relative humidity. Every time the temp changes it's going to take a while for the rh to stabilize and if the temp is in the process of rising or falling it's anyone's guess where the rh is going to be at any given time. I wouldn't be making any changes at all till you're able to get the room temperature stabilized. Could be something else too: like it would have an effect if you've recently added a few boxes of new, wet cigars.