page palette numbers won't change

for reason, of sudden page numbering on pages palette has stopped working

 

when go 'numbering , section options' , change number say, 5, number on page in palette reminds 1. i've opened previous designs, i've numbered accordingly, showing pages 1.

 

what has gone wrong?!

not enough info.

 

is part of book, have created file>new>book , inserted documents?

 

tell more on how set files.

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