Incorrect ToC Indentation

### Current Behavior

Found as a result of #286 being introduced which made reading the headers a lot easier, note how "Communication" is aligned from the left with it's parent, rather than being indented.

It seems to happen whenever we do a 2-step header size jump, i.e. going from a `

` to a `

`

### Expected Behavior

`1.2` should be aligned with `1.1`, rather than `1`.

### Steps To Reproduce

View `/handbook/company`

### Environment

_No response_