Could that arise from any early parity symmetry breaking of the weak force?
If anyone is interested in parity symmetry or CPT symmetry in general, I can't recommend this book enough: https://en.wikipedia.org/wiki/The_Ambidextrous_Universe and in particular the part about the Ozma Problem: https://en.wikipedia.org/wiki/The_Ambidextrous_Universe#The_...
Fascinating stuff.