If is because planned end date is over validated end date

Hello,
I don't understand, in the attached files, it's not the case. But I have this kind of message.

Thanks in advance for your return.

Please show detail of alert.
It may be an alert than is no longer valid, but it's been raised and cannot be removed as an alert : please show whole activity screen.

Hello,

Thank you for your answer. Please see below the details of the alerts and activity :

Thank you in advance for your return.

Best regards

So you have 3 "alerts" raised.
Last ones (57,58) are "alert" level, but not valid any more.
First one (55) is "warning" level, and still valid : you can see orange indicator on top left detail of item.

All seems correct.