Ive had this exact same issue and for me the issue lay in the settings of the revenue info settings in the Sunsynk portal, I set up live pricing which apparently is a UK only feature. This made the timer not function as it should, the timer kept updating every hour with the time of the last hour that has just passed adding itself in the first timer slot and so on and both grid and gen were select on the first 2 slots. Any changes i made which followed recommended formats did not stick for more than one minute and timer reverted back.As soon as I disabled the live pricing and changed back to constant pricing, the issue wnet away. Hopefully this helps