My hair absolutely hates EVOO, but loves other oils like sweet almond, jojoba and coconut.
If I read the original post correctly, you didn't put straight EVOO on your hair, but a deep conditioner that contained it. If you haven't used the product before, are there other ingredients in it that you either haven't used before or haven't responded well to? Since you haven't listed your hair properties or the product you used, it's hard to offer any insight.