Hello Mustafa,
I recommend you to set the zr locations for the hub & shroud curves at outlet and TE to be the same values. You can double click on the points and set the values. This should create a flow path perpendicular to the blades . I am attaching the user guide on link on flow path feature for further details.
10.2.1. Flow Path Contour Creation (ansys.com)
10.2.2. FlowPath Feature (ansys.com)
I hope this helps you solve the problem.
Thanks,
Chaitanya Natraj