Redundant “Red Dot” within the review queues menu

It happens to be that yesterday evening, for the first time since I have access to the review queues, there appeared a - I would call it - "Red Dot Icon" within the drop-down menu.

In fact this notifications seemed to be pointless since there were no review tasks to accomplish as you can see within the included picture.

First of all in order to clear up my confusion about the "Red Dot Icon" I searched here on the Meta page and stumbled upon these two posts:

Both dealing with the topic of redundant notifications for queues which they in fact cannot access in contrast to my case. Therefore I am little bit confused right now.

It has to be added that the notification in the first place appeared since there were about $$7$$ new "Suggested Edits" which were neither approved nor rejected. After completing these review tasks the "Red Dot Icon" did not vanished.

Could someone explain to me what exactly is the reason for this strange behavior of the review queues? Is this a simple known bug or just a slight error which occured yesterday due for example the server refreshing of the review queues?