I'm on android but I also get this issue from time to time. Usually a refresh solves it for me though, at least for a while.
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Do you have any app specific filters? If your app is filtering on a common word or domain then there won't be much. But the web frontend doesn't have those filters. I did something similar trying to filter out all Americans with the keyword "US" in the Thunder app but then I filtered out a bunch of posts to my instance (sh.itjust.works)
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