Incorrect pathing on simple terrain how to fix?

Development World Creation
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1

Hello,
recently I’ve noticed problem with pathing on really simple flat terrain in my prototype.
I’m drawing paths generated for my character so I can clearly see something is wrong here when simply character wants to go a bit around instead straight to the point while there are no obstacles at all.

Is there something I miss out in setting up navigation?

PS:
Forgive me redundant debug spheres etc.

Screenshots:

2

I did not use C++, did it in blueprint using Find path node and then drawing the line from the given vectors.

3

Sorry because this is not an answer…How did you do to draw the generated paths from c++?