Yeah, drop in rank during content update is possible; however, I will also monitor the performance of pages through GSC. If both impressions and positions continue to fall, then it will be worthwhile to check out the search intent and actions taken by my competitors.
I believe it's a small, temporary drop to your previous rankings and it will correct itself after 1-2 weeks time.
Because you have generic seo content on it (written for seo engines?)
sometimes google tends to do some strange things with updates even if the updatte looks much better than the previous one.since there have been drops for all 5 posts u should see if u have made any common changes to all of them such as headings or internal linking before making further content changes.
however i would not hurry nd try to revert the changes right away. there might be a need for google to reevaluate the page nd the next days fall in ranking would not provide sufficient infformation.it is important to determine if the same pages have dropped in ranking for all search terms or just a few of them.
