Why the child model mask is extended in "on-line" nesting when I change Hmin?

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Hello dear members,

I am working with "on-line" nesting and I find some strange things when I choose new bathymetry to the child; this with the aim to change the Hmin of the most coastal subdomains. It looks like the mask of the child extends to the regions covering the new configured Hmin. Notice that when I do not change the bathymetry of the child, this does not happen, however, this way I cannot change the Hmin of the child.

Below is the bathymetry of the child, then a velocity result, where, mainly you can observe what I mentioned enclosed in dark gray circle.

Thank for your kind attention, I remain attentive to your guidance to improve my model.

César.