Something changing my battery charge end time

Hello, my battery charge end time has changed to 23:59 by itself twice now in the past week or so. The control history on the portal says the user was 'server' and via 'external change detected'. The charge start time has remained unchanged in both cases.
I have home assistant, but all of my automations are switched off, and the givtcp log shows no activity that would suggest it tried to change the charge end time at the times indicated on the portal, or any other time for that matter.
I've everything in this state since the end of winter without any spontaneous changes being made and now twice in a week.

On one of the occasions, the change of end time immediately followed a command for the inverter to restart, but not on the other occasion (nothing preceded it).

Anyone have any ideas what might be causing the end time to change by itself?

rich_f Are you signed up for a service like Axle who may be making those changes ? If not have you checked to see that you are not exposing HA or your givtcp service to the internet.

Maxwell
No I've not signed up to any external automations. I would have expected it to have been labelled as a change through an api call if I had and it was one of them, but maybe not.
My home assistant is a very basic local-only install and I've not intentionally set it up to be exposed to the Internet and I would expect the default behaviour to be that it isn't visible, but that's just an assumption.