That's to be expected with your HTML.
What you currently have will generate HTML that looks like the following if
you have 3 reviews:
<p id='votes'>1 vote</p>
<p id='votes'>2 votes</p>
<p id='votes'>3 votes</p>
$("#votes").html("3 votes")
$("#votes").html("4 votes")
$("#votes").html("5 votes")
See the problem?
The problem is that each paragraph tag has the same ID. jQuery will only
update the first one. Each paragraph needs to have a unique ID, then your
JavaScript to update the paragraph needs to update the specific unique ID.
Including the primary key in the HTML ID is a good solution:
<p id="review_<%= review.id %>">
Then your jQuery can update the specific paragraph that it needs to:
$("#review_<%= review.id %>").html("<%= review.votes_count %>")
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