My guesses would be:
32-bit operating system and there's more than 4GB of various memories addressed (RAM, swapfile, graphics card too).
BIOS is misreporting it, but I doubt this. Generally the OS will follow the lead of the BIOS. Might be worth looking at your BIOS version Vs the available versions and see what changes are mentioned.
A fault in the system information program.
You actually have 8GB, and....nah!
Have you tried Speccy? It's a sys info tool from the makes of CCleaner. Basically a slightly nicer way to view the data. Not sure where Speccy pulls the data from, but it might be worth a go.
One last option. If the memory can run in single channel mode. Try each stick in the first slot, and see what is reported for each. Then try swapping them over and see. It would be interesting to see what the sys info programs sees if just one stick is in.
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