Hey there @FabOne420! Welcome to the community! So your agent max step height and your cell height can determine how the nav mesh applies to stairs. Try adjusting them a bit, and if you can’t get a winning combination (and the stairs are a separate mesh) you could set the stairs static mesh to a convex collision but this is a problem for making feet plant correctly in high detail scenes like this.
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check the stair collision.
you can also just stick a blocking volume halfway up for them to stop on