For a question like this, there are several things to check:
What is the purpose and structure of your automation rule? Perhaps post an image of your complete rule to offer some context for the community to suggest ideas.
What do you see in the details of the rule's audit log? If there rule has errors those may indicate what is happening.
From the rule list, what do you observe under the Performance Insights (available from the ... menu at the top-right of the view)? It is possible your rule (or Jira site) has exceeded automation thresholds, and so the rule is being throttled for some reason.
Sometimes there are issues with the Atlassian Cloud rule processing, which you can check on the status page here: https://jira-software.status.atlassian.com/ That does not show any problems for the last several days.
Kind regards, Bill
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