Why am I getting 170 Xp instead of 530+ at the Anachronia Agility Course?

There are several things that can influence your experience gains.

• The Nimble Outfit can increase your experience gain per 1% per piece (6% maximum)

• Silverhawk boots can also be used to gain extra leveled experience

• An XP boosting event may be taking place, thus increasing experience gains

• Bonus Experience may be consumed to increase actual experience gains

According to the official wiki page regarding Anachronia's Agility Course, level 30 course only grants a maximum of 310 xp, thus it's quite likely that the difference experienced may have come from the aforementioned factors