Root Cause
The issue was likely caused by an active A/B test that altered nearby elements, affecting the expected structure of the website's code. This, combined with faulty cache management, led to inconsistent delivery of the website content, causing intermittent errors for some users.
Resolution
After turning off the experiment and clearing the cache, the issue was resolved without needing to undo other changes.
Action Plan
Currently, the team is working to understand the behavior of the tool and implement it correctly. They are also reviewing the tool thoroughly to prevent future issues.