It looks like there is a bug when displaying the stats in xml format on the home.php page.
My stats from the https://www.primegrid.com/home.php page are:
SR5 workunits is 2112
ESP workunits is 302
But when displaying the stats with https://www.primegrid.com/home.php?format=xml the ESP workunits are the same as SR5.
<subproject name="Sierpinski / Riesel Base 5 Problem (LLR)">
<subproject name="Extended Sierpinski Project">