Notification module still display Alerts if it was allready Marked as read in another browser tab

Hello. I use module to display notification (not a normal tollbar).

1) login on site
2) wait for few notification ("5" for example)
3) open new (second) tab in browser
4) in one tab open notification popup (in module) and "Mark all as read"
5) wait / or not wait
6) chose second tab
Result: second tab still display "5" notification.

If I press on bell-icon, popup will be empty as expected. But module still display "5" mark.

Thanks.