The curious thing in your picture ist the Checked (last check time) value. There is something blocking the check of your services or the parsing of the results.
Can you please check the general performance of your server? Also take a look into the log files if something conspicuously appears there.
From the number of your services monitored, your server should check at least around 50 services per second but your performance snapin shows only 3.4/s.