Where does the additional liquid come from?

I’m quite new to Blender (v2.92) and I try to learn and understand the liquid simulation system.
I have a liquid domain and inside of it a liquid inflow object.
My animation is supposed to be 480 frames long.
I animated my inflow object to move and pour liquid for the first 100 frames, after that the movement and the inflow of liquid stops, I can see that in the animation. But nonetheless the amount of liquid in my domain is increasing although the inflow stopped.
So, when I watch my animation in frame 100, when the movement and the inflow stops, the domain is filled with liquid maybe 20%. but as the animation progresses up to frame 480, all the domain is filled with liquid.
So, where is the additional liquid coming from?