pr0tex You've got the right folks helping you now, I'm just a layman.
I did see your screenshots on Reddit and it reminded me of an issue I had. If your sql mode is set to anything other than "traditional" you'll see you have new clients on the dashboard, but they won't display on the clients page unless you specify dates. You can fix this by adding the following line at the bottom of config.php.
$mysqli->query("SET SESSION sql_mode = 'TRADITIONAL'");
You can alternatively change the mode permanently using phpmyadmin, but I used the first option so I wouldn't affect the other databases I'm hosting.