I'm stuck with an issue in Typesense. My initial query is:

{
  "q": "wooden 3 drawer storage unit",
  "page": 1,
  "per_page": 40,
  "query_by": "title"
}

This returns only 1 result. For my second query, I added a filter:

{
  "q": "wooden 3 drawer storage unit",
  "page": 1,
  "per_page": 40,
  "query_by": "title",
  "filter_by": "(sources:=`some_source`)"
}

Logically, this should return a subset of the results from the first query. However, it returns 9 results instead. Why is this happening?