Railings Base not following a line

[M_Perez]

Could someone explain this to me?

If horizontal, the base line is a line, but if I put it on a stair, the baseline doesn't follow a line anymore and start to jump up or down, and it doesn't even behave equal in every stair. What am I doing wrong? How can I solve it?

[M_Perez · Accepted solution]

The instance parameter "Offset from Path" was the key. By positive values the railing is over the steps and follows this line. With a negative value the railing will follow a line and my problem solved.