Trim with regions ... why trim all the way up?

Hi all,

I try to trim a set of curves by using trim with regions, and the set has a duplicate right above it.
The region curves lay on lower level, but it trim all the way up to those curve above like a shaft.

Any help would be appreciated.

trim with (6.8 KB)

That’s weird. Looks like you have no choice but to separate the lower curves from the upper ones.

trim with (13.8 KB)