Breathing rhythm

[fazhou]

Hello. Do you find that as you're going through your form that the rhythm of your breathing changes depending on which posture you are in? Not because of any difficulty of the posture but due to the inhale/yin exhale/yang idea? It seems like the duration of my inhale, for example, is either shorter or longer depending on where i'm at. I am practicing belly breathing into my dantien and I feel like sometimes that I don't inhale a "full" breath because it is time to exhale. Make sense? Is this normal? Thanks in advance.