Battery Charging without me telling it to.

Im on intelligent flux o I don’t get the cheaper rate at night for charging yet my system seems to charge my battery at night. I’ve got all setting switched off for charging. Yet it does it every night. It then doesn’t seem t be discharging the battery when I look.
Any ideas

You get a 21 hour off peak rate, so overnight is off peak.

You've given octopus control of your battery with that tariff. They'll do, within reason, what they want with your battery.

If you don't like that, you're probably on the wrong tariff.