stair weird question

[utakecare2003]

i have this stair, see the attached images, i would like to move the top riser south a little bit, but after i move them, the middle landing is gone. I cannot figure out why and how i should correct this.
any idea? thanks

[mthurnauer]

I don't know if this could be the reason, but I don't see the usual stair run line (Blue line in center of run) on your stairs. FWIW: I notice you have your treads dimensioned to 10" I am wondering where this project is located. In most codes in the US stair treads require a min. depth of 11" from nose to nose.