Question Motherboard recognizes both my RAM sticks (16gb DDR3) in POST but only shows 8gb in BIOS

[Mage2IsTriggered]

I have been looking for help all over the internet for my problem, can't find anything that i've tried that has helped so far, so i created an account here to see if anyone can back me up.

Last month, i ordered 2 sticks of 8gb RAM for my mid 2010s office PC im turning into a light gaming rig. They are both working and correctly detected and were usable, even after i swapped APUs, so are both DIMM slots on my MoBo. 2 days ago, i swapped cases and all was working wonders, during POST the motherboard detected both RAM sticks as 16gb (DDR3-1600) and booted up just fine. But when i went to Windows, i realized that while it showed all 16gb were present, 10 were "Reserved For Hardware" (8 from one stick, 2 from my VRAM setting, and no, it's not the culprit). After that i went to check the BIOS itself and it showed only 8gb as usable, even if when i went to the RAM info section of my BIOS, it showed both sticks, with the correct information and details.

I have tried everything i could safely so far: Running msconfig, using all the Windows repair tools, running MemTest (which all showed no errors), i have tested either stick individually in each slot, i have reseated my CPU while checking for bent pins (none), and nothing has fixed it. I have yet to try clearing the CMOS clock with the jumper and update the BIOS, but i'm keeping those as a last resort because my system is kind of a freak...
It's an FM2+ MoBo (A58M-A/BR, A58 chipset) running an early BIOS with a partitioned HDD with Windows 10 and Linux i am yet to replace with an SSD (frankly, updating my BIOS or resetting CMOS scares me, i hate dealing with software that can fry all college stuff and games i have).

Should i just bite the bullet and either update or clear CMOS? Is it dangerous to a partitioned drive?

Specs:
Motherboard: ASUS A58M-A/BR, BIOS 0701
CPU: AMD A10 PRO 7800B APU
GPU: Integrated Radeon R7 Graphics, drivers 20:3:1
RAM: 2x8gb DDR3 1600mhz

Edit: CPU-Z check shows it's running in single channel

 

[Mage2IsTriggered]

Solved: I have no idea what exactly did it, but i plugged in my old 8gb 1333mhz RAM stick, and it booted normally in single channel. I then took it out, dusted off the DIMM slots with a brush gently, plugged both current sticks in and it worked just fine. I don't know if the other stick reset the memory controller, or if there was some dirt stopping proper reading. Either way, i got 14gb usable now, since 2 are VRAM until i grab a GPU. Leaving this here in case someone has a similar issue, be it with DDR2, 3, 4 or 5, all solutions i found online i tried didn't work, but this jank fix did, so if you can, give it a shot if needed!