My grandmother gave me her basic white bread recipe for the bread machine. The recipe works perfectly at her house in Canada-I enjoy the fluffy white bread. However, I have tried the same exact recipe at my home in Ohio. Every time, the bread always sinks. The inside isn't too bad, not incredibly dense, but it could certainly be fluffier. I am confused as to what may be the problem and how to fix it. Is it the humidity? Thanks in advance!