I am running a gwas on my data- I have done all the QC analysis according to the nature protocols. however , after running a GWAS, I noticed that all the SNPs had identical correlation to the different phenotypes (in my case I have my principle components for the traits) which Im using as phenotypes (PC1,2,3 and so on)

any one who can guide me what might be the potential causes of this or is this an issue with the QC and should I redo it?