Frustrating humidity

So, the new arrivals to the household are here. Bandit & Buttons, the dynamic brother duo. I thought I'd be the most excited person alive once they got here and got a little settled in.. but then the atmosphere had to mess everything up. I have a dry heater running and an AC (that's suitable for the room I have space-wise) with a dehumidifying function. Those two are on A LOT. But, for some unknown reason, the humidity won't change from 56%. The temp control is fine, it usually stays around...

Frustrating humidity