I noticed that the colour of notification icon has changed since 2 days.
This is how it looks like to me here on Meta.
Formerly, the notifications colour icon used to be brighter and eye catching like this.
The former colour was eye catching and brighter than the current one. The current one indicates (to me) that there is an urgent matter to handle like the review queues.
Is this the change due to the experiment going on with the review icon? I tend to think so because the red in the review icon and the red in the notification looks very much similar. Below is an image from Movies&TV Stack Exchange where I have access to review queues.
Is this due to the experiments on review icon? Is there anyway to fix it?