Question Slot B on the motherboard can't go beyond 2800MHz

[Seelkadoom Bluestar]

I purchased the memory second hand and was told by the owner they were a pair in one kit. The exact model is PVS48G320C6. this is written on both ram sticks.
The problem: Booting the system with one or both memory sticks at stock speeds (2666mhz cl19) is fine but when I enable XMP with both sticks installed, the BIOS reports 2800mhz instead of 3200mhz

I've tested each memory stick alone on each slot on the motherboard while enabling XMP and these are the findings:
Memory stick #1 on slot A: runs at 3200mhz cl16
Memory stick #1 on slot B: runs at 2800mhz cl16
Memory stick #2 on slot A: runs at 3060mhz cl16
Memory stick #2 on slot B: runs at 2800mhz cl16

Both memory sticks run at 2800mhz cl16. What could the issue be? the memory? the motherboard? perhaps a combination of both?
I might be able to get my hands on a set of patriot viper steel 3600mhz cl 18 memory soon for further testing but they will be separate sticks not sold as 1 kit. If someone has any idea or has faced a similar issue before or has any advice in general, any help would be appreciated.

System specs:
CPU: Intel Core i5 12400f
Motherboard: Gigabyte H610M H V3 DDR4 rev 1.0 on BIOS version F3
RAM: 2x8GB Patriot Viper Steel 3200MHz CL16
GPU: EVGA RTX 2060 SC
All CPU-Z pictures are shown with XMP enabled.

https://imgur.com/a/CtPcbTw

 

[--SID--]

What do Hwinfo64 and CPU-Z report?

 

[Seelkadoom Bluestar]

What do Hwinfo64 and CPU-Z report?

Just posted the pictures now. Sorry for not posting it earlier

 

[--SID--]

Is the cpu socket dasmaged?

 

[Seelkadoom Bluestar]

Is the cpu socket dasmaged?

No. the build is brand new and was recently assembled except for the memory is 2nd hand.