After revoting on question opening or successful flag, cross symbol in the notification message is broken.
Revote for opening:
Vote for opening:
This issue seems to have been fixed (checked on Meta.SE, Meta.SO and one other site):
I am quite sure that the fix was related to this answer by Nick Craver:
Update: Meta has been reverted to master. We'll be at the drawing board figuring out how to fix this if anyone needs us.