about STRAND correction for imputation

Question

[nayeona.hi]

I am doing imputation with AffyMetrx 5.0 array chip data.
It was quality-controlled, and I am trying (Shapeit2 and Minimac/impute2) and (Michigan Imputation Server),
but keep failing. (Ref. panel: 1000 genome EAS or ASIAN)

I did qc - rs Id - chr and position correction.
The analysis results say:
Match: 56
Allele switch: 50
Strand flip: 47
Strand flip and allele switch: 64

How can I correct Allele Switch or Strand flip into right?

Thank you.