Hi hackermade,
If you get index.php when you click the logo, you can Open the /templates/ja_blockk/html/layouts/t4/element/logo.php file:
add this code to line: 24:
$baseurl = JURI::base();
And replace this:
<a href="index.php" title="<?php echo strip_tags($site_name) ?>">
With the following code:
<a href="<?php echo $baseurl; ?>" title="<?php echo strip_tags($site_name) ?>">
Also, You can follow this guide to remove the index.php in the URL.