Ok...
This is really not a big bug but whatever...

I have set two secluded two tasks to remind me something every day.
If i wasnt signed in on msn while I have missed these tasks, and I sign in, their toasts appear the one ontop of other. (explaination below)
I believe that this happens because when I sign in to msn, all the right part of my screen is filled with "[user] has signed in" toasts.
After they are gonna, under them, there is a toast that says that I missed a task and under it another toast that says that I have missed another task.
So:
Msn toasts disappear.
Under the first msn toast (counting from the bottom to the top) there is a toast that says "You have missed a secluded task! [task1 description]". I click "(click to close)" and then under it there is a toast that says again "You have missed a secluded task! [task2 description]".

So as I told you, it's nothing big...
The task toasts shouldn't appear under the first task toast...

hmm... This sounds like it is caused because the same event is happening twice at the same time. If theres a buffer system for the messages, which there should be, its probably a little error thats easy to fix. If there is no buffer system for toasts, it might be a little harder to fix.
It seems like the name of the event has the same name as the one its on top of, so it assumes they're the same event or something to that effect.