Hey buddy, that's a nice KE!!
Here's why it's not lower:
Your KE only measures [REWARDS]/Hive Power (Hive Powered Up)
Since you have more Hive Staked than your rewards, you have a KE < 1!
However, you have 8k Hive and 3,250 HBD floating around so those don't count towards your KE 😊