Why need refresh page when use JQL to get a sum of time logged using aggregateExpression?

[Cecilia Chu]

I test use JQL(key = CTT-4287 and issueFunction in aggregateExpression("Total Time For all Work","timeSpent.sum()") to get sum of time logged using aggregateExpression in jira.

But I confuse why I need to refresh the page. and then the result number can show up. We never had to do that before; it just always calculated it and presented it when you pressed enter on your filter.