PathNodes on Stairs don't work correctly

[Shirder]

Hello forums and Merry Christmas

I just signed up, so sorry if I am in the wrong subforum^^

So, I'm actually new in scripting and mapping. And I've got many problems, but I could solve them in some way, also by visiting this forum. Now I thought of signing up. People here seem to be able to help

Enough talked, here's my actual problem:
I want a monster to walk down some stairs. (I don't want to post main informations about my map, because I don't want to spoil if I publish it some time ) I've made the script working, the monster spawns at the right time and walks down the stairs. But on every step it stops for a second, which takes it long time to walk down.
I've also taken a look at the original Amnesia maps (prison_south in this case). It shows that the PathNodes are sort of "pressed" against the edges of the steps. I've done this in my map too, nothing changed.

Is there a way to make a fluent animation?

Anything helpful is much apprechiated