shield wall bug

Hello. I'm facing this problem: I'm playing as a Titan with the shield wall skill, and I've acquired a level 21 gem with a quality of 23. However, it deals less damage than a level 20 gem with a quality of 20.
Hello. I'm facing this problem: I'm playing as a Titan with the shield wall skill, and I've acquired a level 21 gem with a quality of 23. However, it deals less damage than a level 20 gem with a quality of 20.Hello. I'm facing this problem: I'm playing as a Titan with the shield wall skill, and I've acquired a level 21 gem with a quality of 23. However, it deals less damage than a level 20 gem with a quality of 20.