The RSS feed seems not to have the same filter as the site does. A bogus post with some expletives showed up in the feed but not on the site. Could this be fixed?
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As stated by random, this is purely a timing issue and thus impossible to reliably control; if you happen to get the feed before the posts are deleted ...
It's probably because by the time of the RSS baking and delivering itself to your aggregator of choice, the spam filled and/or hateful sandwich was deleted just a little too late for it to not be captured and push your way.
Might be solved if the feed baking was done a little later. But who knows when the questions are deleted/removed/closed before making it into the feed update?