Not all products are being added to a collection

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I am setting up a new store and for some reason, not all products appearing on a page. 

For example on the Table Linen Page only 10 products are showing on the live store, but I have 50 products tagged "Table Linen" in the Products area of the admin site. 

The menu links to an Automated Collection - the Table Linen Collection which matches any condition of the Table Linen Tag in which 50 products are active.

Any ideas?

Thanks for your help.