Great question — answering as the UphillTech team:
It sounds like the drop in rankings could be related to the recent changes, even if performance seems fine. Sometimes, even small adjustments can affect how Google views your site. It might be worth checking if any key elements (like metadata, structured data, or internal linking) were unintentionally altered during the fix. Also, consider if the changes impacted how Google crawls or indexes your site. If everything seems correct, it might be a good idea to monitor the situation and see if rankings stabilize, or consider reaching out to an SEO specialist for a deeper look.
Full answer by user146651: https://webmasters.stackexchange.com/a/145523 (CC BY-SA 4.0).
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