Memtest86 shows 13.9gb memory while I have 2x8gb installed

I have added another 8 gb of ram on my thinkpad laptop. I am running a memtest now and it shows 13.9gb of it. Is this normal?

enter image description here

Laptop specs:

Lenovo ThinkPad T495-20NKS01Y00

Processor: AMD Ryzen 5 PRO 3500U 4 x 2.1 – 3.7 GHz, Zen+

Graphics adapter: AMD Radeon RX Vega 8 (Ryzen 2000/3000)

Memory: 16 GB
, DDR4-2666 limited to 2400, dual-channel, max. 40 GB