Alert on Multiple Servers

Trying to set up a simple alert for multiple servers. The graph works perfectly, but the alert works only once even if other servers breach the threshold and go into alert status. I assume because the original alert status has not changed back to ‘OK’. We will always have multiple servers going in and out of alert status at the same time… Am I missing something, or is this the way it is supposed to work.?

I appreciate any guidance on this. Thanks!