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I have also had this problem when trying to respond to people who have responded to an earlier post of mine asking for clarification. Eventually leading me yo give up trying to respond 
FWIW, there's a Q about this in Discourse support, but it seems like the question-asker didn't follow up:
https://meta.discourse.org/t/topic-is-similar-to-is-never-remotely-similar-to/67906?u=batpigandme
Though, FTR, the pop-up seems like a somewhat touchy subject…
Is it AI, or just a bunch of "if" statements?