There's a weird issue going on with OIG beta at the moment. We're not getting mapped slots through in time. For now, only the default window will be applied.
Do let us know when custom charges have been mapped outside of that by Octopus though and your WattID so we can investigate this further.
Also, let us know how quickly between plugging in and you getting the mapped charges through on the Octopus app please. If this is now taking longer, that could be the cause of this issue.