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A post on "How does light speed up when it exits a denser material" has disappeared completely. There was an answer from JeffreyH to post 49 at bottom of page 2 that is no longer evident.
I have never visited a site whereas it was possible for a "user" to delete entirely the evidence that one had ever made a post - only that it be possible that the content be deleted and just leave a full stop! Therefore this must be a case of a system error.
It might be an error if Jeff didn't delete it but this is one of the forums that you can delete posts. The reply numbers following the deleted post will change to accommodate the new listing.
Ask Jeff if he deleted it.