A recurring issue in seo title writing is easy to describe: title tests are judged only by click-through rate. Resolving it requires checking the underlying condition as well as the visible result.
Find the likely cause
Position and query mix changed at the same time.
Treat this as an explanation to verify against the actual work. Look at the input, the relevant decision, and the final result together. If the evidence does not support this diagnosis, investigate the mismatch before applying a convenient but unrelated fix.
Make the targeted correction
Compare similar queries and record important context changes.
A useful page title identifies the subject and distinguishes the page's specific value without promising unsupported results.
Check that the repair worked
Avoid attributing every click change to wording alone.
Repeat the check on the final version that the reader or customer will encounter. An approved draft, a preview, and a published result can differ; the acceptance decision should concern the version people actually use.
Prevent the next related failure
A separate issue to watch for is this: titles become unreadable keyword lists. Use natural language around one primary subject.
Monitor the useful outcome
Review query relevance and click behavior in context, including changes in position and audience mix.
Keep a short record of the original symptom, the evidence behind the diagnosis, and the result of the acceptance check. That record makes the solution reusable when the same condition appears again, without assuming that every superficially similar problem has the same cause.
Official reference for the platform or standard discussed: Google Search Central: title links.