Same prop broken every flight Im done with it plz help

@Sjuriyan wrote:

Hi my Quadcopter sk 450 frame
Pixhawk fc
750 kv motor

My problem is weird !
Almost every flight one of my prop broken
The weird thing is
The broken prop always Same motor (back left) other motors never broken and every time IT CUTTING FROM SAME PLACE EXACTLY!! 2sm from the hub

I try to change the prop adaptor but that didn't fixed my problem

I am very nervous because i don't know the reason

I can confirm that my prop didn't touch anything

What do you thing the reason of my problem?

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