Inteligent Octopus Go, EV CHarge question

So last month my monthly big went up £70, I did phone them but they coudn't see anything wrong, so since noticing Octospy (Great Tool), I used my api key to view the breakdown, I notice that when I charged the car, usually twice a week, these are when I'm home, usually after 10, and back out back of 8 next day, so have just been using the 11:30-5:30 to charge, Octopus have been charging me the peak rate not off peak, this I assume is why my bill, was so high last month and probably this month too.

My question is this correct, I only charge overnight as I get in quite late, and only for 6hr's, I have a smart meter display, and the price seems right compared to what i am actually being charged.