I don't know much about all this but understand that after one day of HF20 all is ok for high SP steemians like more than 2000SP.
The voting power is charging from 0 to 100% after HF20. on day of HF it was goes to 0. That's OK. This will happens some time when changes are done.
Now, it will take some days to come normal to all steemians. For me, no matter VP is 100% or 5%. but important is, it should work. and Now it is working good. Our 24hour vote value is same only quantity of votes increase or decrease respectively VP decrease or increase. This is vice versa phenomena.