Hello!
From https://developers.google.com/search/docs/advanced/appearance/good-titles-snippets:
If we’ve detected that a particular result has one of the above issues with its title, we may try to generate an improved title from anchors, on-page text, or other sources. However, sometimes even pages with well-formulated, concise, descriptive titles will end up with different titles in our search results to better indicate their relevance to the query. There’s a simple reason for this: the title tag as specified by a website owner is limited to being static, fixed regardless of the query.
In your case, I’m afraid there’s nothing you can do to rectify this. Perhaps, they’ll switch it around another time, for another user, using a slightly different query. Sometimes, Google even experiments with titles on their own accord. In any case, it should not affect the click-through-rate; Google aims to improve it actually.
