Steps to Reproduce

1. Go to any article
2. Add it to or remove from your watchlist
3. See a pop-up appearing
4. Try to go to your watchlist by opening the user menu drop-down

What happens

The watchlist item in the user menu is hidden behind the pop-up despite you opened the user menu later:

In order to click on the relevant menu item, you need to wait for the pop-up to disappear or to click on it.

What should happen instead

The user menu drop-down should be displayed on or above (that is, overlapping or moving below) the watchlist pop-up.