2760p ONLY detects 8gb of RAM

Hi, this is the first time I post something in this forum even though I have found it very useful in the past, sadly I have not found my issue in any other posts.
What happens to me is the following:
I have an HP 2760p, I have two 8GB 1333 RAM modules installed in it, my problem is that my laptop detects both as if they were 4GB modules (it even detects an incorrect serial number for them) when they are both plugged in. When only one is plugged in, no matter which module I put in RAM 2 (under the keyboard), it is detected as 4GB, whilst if I put the same in RAM 1, it's detected as 8GB. I am perplexed at this situation, does anyone have idea?
It is detected like this directly by the BIOS. Is there some kind of limit I was not aware of? AFAIK in the information I've read about the 2760p, it's capable of up to 16GB.

I looked at the 2760p Maintenance and Service Guide at URL http://h10032.www1.hp.com/ctg/Manual/c03011611.pdf
Refer to page 57. It stresses checking the BIOS update level. The problem may also be a connector's problem with one of the address pins or anywhere on that address line on the motherboard, but start by checking the bios revision.

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