– Does the title actually contain the word “the”, or is it prefixed within the theme layout?
– Does this happen if you type in the search keyword in full lowercase?
– Is the fulltext search mode activated? (Fulltext search options submenu) In some cases the database ignores some words or word combinations in fulltext mode.
– What is the Keyword logic set to? https://i.imgur.com/Q9SGAGa.png
If it's “And with exact word matches”, then the “the” part is actually not stored in the database, or at least this is what I suspect. Or it's an unknown bug yet.
– Is the “Show exact matches only” option turned on or off? What happens if you type partial phrase, like “he servant” or “the serv”?
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