Grey quests why?

[ankido]

What's the point of using this guide if half of my quests are grey? This is not how leveling was done back in the day.
World of Warcraft (gyazo.com)

This is ridiculous.

[ZG Support 1]

What level are you? When did you start using the guides? Did you use the SiS system to get put into sync with the guides?