ajax php pagination wont show active page - php

Question

I am working on a php ajax pagination.
The problem is that it wont ad the class="highlightActivePage" proper.
If I click on 1 - 2 - 3 , it works fine and highlight the number 3 if im on page 3.
But soon as I click on page 4 it highlights page 5 instead, etc.
Not sure if my for loop is wrong, but here us my code:
if (paginationHTML == "")
{
paginationHTML += "<ul>";
if (adResultsData.show_first_text == 1)
{
paginationHTML += "<li><a href='#' onclick='fetchResults(1);'>First</a></li>";
}
if (adResultsData.show_previous_text == 1)
{
paginationHTML += "<li><a href='#' onclick='fetchResults(" + (adResultsData.current_page - 1) + ");'>Prev</a></li>";
}
for (var i = 0; i < adResultsData.pages.length; i++)
{
if (adResultsData.current_page == (i + 1))
{
paginationHTML += "<li><a href='#' class='highlightActivePage' onclick='fetchResults(" + adResultsData.pages[i] + ");'>" + adResultsData.pages[i] + "</a></li>";
}
else
{
paginationHTML += "<li><a href='#' onclick='fetchResults(" + adResultsData.pages[i] + ");'>" + adResultsData.pages[i] + "</a></li>";
}
}
if (adResultsData.show_next_text == 1)
{
paginationHTML += "<li><a href='#' onclick='fetchResults(" + (adResultsData.current_page + 1) + ");'>Next</a></li>";
}
if (adResultsData.show_last_text == 1)
{
paginationHTML += "<li><a href='#' onclick='fetchResults(" + adResultsData.number_of_pages + ");'>last</a></li>";
}
paginationHTML += "</ul>";
paginationHTML += pageSpan.innerHTML = "<br>Page " + adResultsData.current_page + " of " + adResultsData.number_of_pages;
}
php
$numberOfPages = $results['pages'];
$currentPage = $results['currentPage'];
if ($currentPage != 1 && $currentPage != 2)
{$showFirst = 1;}
else $showFirst = 0;
if ($currentPage != 1)
{$showPrevious = 1;}
else $showPrevious = 0;
if ($currentPage != $numberOfPages)
{$showNext = 1;}
else $showNext = 0;
if ($currentPage != $numberOfPages && $currentPage != ($numberOfPages - 1))
{$showLast = 1;}
else $showLast = 0;
if ($currentPage <= 5 && $numberOfPages <= 5 || $numberOfPages <= 5)
{$startingPage = 1;}
else if ($currentPage == 1 || $currentPage == 2)
{$startingPage = 1;}
else
{$startingPage = $currentPage - 2;}
$pageNumbers = [];
for ($i = $startingPage; $i < ($startingPage + 5) && $i <= $numberOfPages; $i++)
{
$pageNumbers[] = $i;
}
$pagesString = implode(", ", $pageNumbers);
$listingsString = implode(", ", $listingsArray);
$jsonString = <<< END
{
"resultsTotal" : $numberOfResults,
"listings" : [$listingsString],
"number_of_pages" : $numberOfPages,
"current_page" : $currentPage,
Thanks!