Hi, a little curiosity, until now I didn’t have a problem with whispers. I just created one this morning on a post I authored as admin, and the whisper appears in the post. However, as soon as I refresh the page, it disappears - it’s not deleted since it appears in my activity. But it does disappear from the display. Weird, is’nt it? 
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After testing whispers do not appear after topic cooked when the Discourse Post Voting plugin is enabled in that category.
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And believe it or not, a few hours later, these whispers reappear in the thread… Magic sometimes works 
And disapperead a few minutes later.
Looks like an intermittent bug 
Not related to post-voting then?
Usual questions:
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Does it happen in safe mode?
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Are there any suspicious errors in /logs or in the javascript console (from your browser’s developer tools)?
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Are the whispers hidden (via CSS), or not even present in the HTML code (you can inspect the code with the same dev tools)?
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Adding that in a category where the post voting is not enabled, the problem does not occur. And happens on Firefox and Chrome.
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Thank you @Moin for your reply here. it explains the behavior but it poses some fairly significant problems firstly, if there is only one initial message in a discussion and no reply, the whispers will never be visible even though they exist secondly, by default we are in voting mode and not by activity, so the whispers will never be visible either.