ProRes Proxy on the bmpcc 6k pro looks like cheese why?

ProRes Proxy 1080 broke! Why is This Happening? after shooting i check the footages and it looks like it was downloaded from a 480 clip can someone help me? Other times the clips on the ProRes proxy looks clean while sometimes i get broken type of footages straight out of the camera at 1080 proxy this was shot on the 6kpro Bmpcc

i never used prores proxy be cause is too low quality, too much compressed.
anyway every different footage seems different be cause content drive quality.