This is a fairly complex alert, so it's really difficult to even speculate where the issue is. My recommendation would be to simplify the alert significantly using the out-of-the-box "Alert me when the free space of a volume is less than 5%" alert. Modify this alert to trigger when any volume is using more than 1% capacity, and see if that alert fairs any better. If it does, then we'll need substantially more information to troubleshoot and diagnose where your existing trigger condition is breaking down. It would probably be best to either option a case with support or post this question to the Alert Lab.
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