Weird: Collection not listing all resources

This occurred for the first 4 attempts at displaying two Collections. Initially only one resource was displayed, What does the bible Say about, common to both collections. Then more resources as below:-

The count (24 above) was always correct and Library would display the resources as expected.

The other collection is type:dictionary subject:bible -mytag:lexicon rating:>1

The list came good after I displayed a couple of other collections.