XF 1.5 I'm receiving only few, random, Alerts / notifications


Hello, me and my users are receiving much less Alerts / notification than it should.
I am watching many threads, and I am receiving notifications only from few of these threads, and not all notifications.
I am talking of both the Alerts window in the upper right corner, and the Alerts popup in the lower left corner, and the page /account/alerts.
If I go to the page of my watched threads I can see those threads updated, but I did not receive any notification about the new posts in those threads.
What am I missing?
Only a single alert is sent for each watched thread until the new posts are read or the thread is marked as read.

The alerts in the bottom left of the screen only appear for certain actions and are triggered by performing ajax related actions (posting, etc.).
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