Unexpected search results when searching in specific group

My production site is running Elgg2.3.7. We notice that when searching for some text within a group (Search in this group), it returns other entities that don't belong to that group. For example, I search for a word 'computer' in a specific group, it returns not only the list of objects in the group but also other objects that have the word 'computer' in it.

Is there anyone who experiences this search behavior? Is it a known error?

Thanks in advance!

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