is it possible that my new growth is high/medium porosity and the rest of my hair low ? if
Yes. It's possible to have more than one porosity in your hair.I.E. if you dye/bleach your ends but your hair is naturally medium porosity, due to the color damage your ends could be high porosity. hope this helps, xo. :)
How bizarre. People can have a combination of low/high porosity hair, but the ends of the hair would usually be more porous than the roots.