I received a normal type of notification, but it alerted me to an excessively high balance on a credit card. Right next to it was posted the actual balance, which was verified when the credit card site was checked. This can be seen in the screen clip below, and support was unable to offer any explanation.
Note the time stamps on both the credit card and the notification are within minutes of each other, so it's not a matter of a delayed synchronization. It's of little consequence, other than it was disconcerting and required time and effort to verify.