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CL15 RAM runs on CL16

Level 7

Hello. As you can see on the screen above my ram timings are
16-17-17-35 although I set the XMP profile in BIOS with the
15-17-17-35 timings.
I also noticed that if I change CAS latency in BIOS to 15, it jumps to 16, if I set 17, jumps to 18 etc. but if I set 16 or 18, the value doesn't change.
My ram is Corsair Vengeance LPX 2X8GB 3000 MHz CL15 and it is compatible with my ROG B450-F GAMING.
My BIOS version is 2301.
What should I do? Is it a BIOS problem?
Thanks for your help 😄

Level 7
Not a problem just a AMD memory timing setting...
GDM - Gear Down Mode Only Runs at even CAS Settings 15=16 17=18 19=20 ........
Your memory may not run high bus speeds with it off... Have to test... Very Little Performance loss with it Enabled...