The issue of mount Rak'Shiri speed

My friend and I purchased mount Rak’Shiri. After the last server update, although the game displayed a speed of 100%, the actual speed was only 60%. Many people also have the same problem. What should we do?

Greetings, please provide solid proofs. Like one person with 150 riding skill and Rak’Shiri and other person with 150 riding skill with some common 100% mount, running both, record it on video.