Book TOC wrong order?

Greetings,

I've just created an InDesign book with each of its chapters being an InDesign document. Each chapter needs its own TOC and there is a separate chapter for the Main TOC. All works fine but for some reason, an entry in the Main TOC is listed as being on page 1 but yet falls after 3 other entries, one on page 1 and two on page 2. See below:

Table of contents

Before you begin

Getting started ..................................................................... ............................  1

Read-ahead control codes ..................................................................... ..........  2

Read-ahead control for macros ..................................................................... ...  2

Scope ..................................................................... ........................................  1

'Scope' is the first heading followed by 'Getting started' and so on. I've tried everything obvious but to no avail – can anyone shed any light? Bug?

Thanks,

Wes