I just want to build two similar stairs in two similar 6 x 6 m grids by copying a stair.
However, after I copy the stair from one grid to another grid (definitely from the same reference position in each grid), the height of the latter stair changed automatically. And I cannot change its relative height to the correct value. (It will resume after I change it)
In the screenshots, the right stair is the problematic stair, the left stair is the right stair.


Should I completely redraw the right stair?
Thank you in advance : )