The symptom is specific: marketing experiments have no stopping rule. Start with the affected item and identify the decision or input that could produce this behavior.
Find the likely cause
The team checks results until a preferred answer appears.
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
Choose a review plan appropriate to the decision before starting.
A useful experiment turns an uncertain marketing decision into a comparison with a clear interpretation.
Check that the repair worked
Record any deviations and avoid presenting them as preplanned.
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: the experiment changes midway through the run. Freeze the tested versions or restart the comparison after a material change.
Monitor the useful outcome
Report eligible exposure, outcome counts, uncertainty, and operational cost together.
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.