Weird update application user interface

When I receive a notification regarding some available update for some app, I click on the notification, the list with the apps that can be updated is displayed, I click on “update all”, a progress bar show me how much of the update has been downloaded, and then the button change into “open”.

This is a bit weird to me, what I expect as a user is a message that tells me something like “app X has been update”.

Also, sometimes the blue loading bar at the top of the screen keep moving from left to right event if the update has already been installed.