When robots build from blueprints a loader is not always placed facing the direction indicated by the blueprint.
For example a setup like: Machine, > Loader, > Loader, Passive Provider Chest
May end up like: Machine, < Loader, < Loader, Passive Provider Chest
This results in having to manually check every Loader placed with robots. A very time consuming task with larger blueprints or frequent copy-pasting.

Yeah I also noticed this behavior.

Noticed that as well. I wonder if that can be related to loaders trying to be clever and match their direction based on being adjacent to a belt or a building. They seem to prefer to match an adjacent belt direction or to be outgoing from a building.
Maybe in a case of Machine, > Loader, > Loader, Passive Provider Chest, the placement order matters?

I will investigate about this

All loader mods have been like this too. Maybe Angel666 or Deadlock already knows about the issue facing blueprinting and having wrong loader orientation. It's probably not easy to fix?

I have reduce this bug in the 0.9.15