I'm guessing you are using some kind of grouping of results? In that case there is actually a known issue, which is going to be patched in the upcoming version.
Until then I have a very quick fix for the issue.
Open up the \wp-content\plugins\ajax-search-pro\includes\views\results\group-header.php file on the server.
Go to the last line (21), which should be this:
<div class="asp_group_header"><?php echo $group_name; ?></div>
Change that line to:
<div class="asp_group_header group"><?php echo $group_name; ?></div>
That should solve the issue 🙂Best,
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