When not floating the notification is quite far from the right of the screen:
The original top position here is also quite odd, partially overlapping the tab bar. In Vector1 it is full under the tab bar.
When scrolling past the original position, the notification jumps to a fixed position which is much closer to the right:
This also creates a problem with the user menu, when open.
The watchlist item in the user menu is hidden behind the pop-up despite you opened the user menu later: