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Hi there,
Glad to hear that Akismet is at least catching all those for you.
The fact that you updated the post (not necessarily what you updated it with) might have made the latter resurface in places that might track your blog (search engines, blog aggregators, etc) as “new”, which in turn might have triggered he spam influx. Spammers thrive on new content, because they assume that it’s where engagement will happen, and they’ll get the most proverbial eyeballs if their spam makes it through.
It’s an unfortunate reality of publishing online, and in part why Akismet exists. 🙂