I believe Kite's RSS feed is not respecting the RSS specifications. The GUID is supposed to uniquely identify an entry, which is not the case for Kite. Instead, the GUID is always set to the same value, e.g., <guid isPermaLink="true">https://kite.kagi.com/?article=science-1</guid>. This breaks at least Newsblur, but potentially other RSS aggregators as well.
A potential fix would be to remove the isPermaLink attribute and instead set the GUID to something like science-20250613-1 in the above case.
Alternatively, the GUID element could also be removed as it is an optional element.
