I found the problem.
In the image that I posted, when I hover my mouse above the “6”, no mouseover is produced.
The relevant element is
<div class="only-like discourse-reactions-counter"
id="discourse-reactions-counter-1026062-right"
data-click-outside="true">
<div class="discourse-reactions-state-panel max-length-1"
style=""></div><span class=
"reactions-counter">1</span></div>
it should have a mouseover saying “click to see details (about those 6)”.