'Publish Pending' dialogue still visible after publish date and time has passed

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Hello there
Having a small problem with the 'future publishing' feature of Concrete5. When editors set a future publishing date and time, the page is saved and published correctly. However, editors still see the blue dialogue box 'Publish Pending' even when the date has passed and the page is published. At present, it says "This version of the page is scheduled to be published on 7/1/19 at 12:01 AM." even though the 1st of July is now passed. On the surface of it this doesn't sound like much of a problem, but it is because site editors become confused and worry that somehow the wrong version of the page is being displayed.
Running latest C5.
Hoping someone else may have experienced this.
Best wishes
Daniel