ram running 3603 instead of 3600

So I have an Asus Maximus XI Code motherboard with an i9-9900k CPU. The issue I’m having is that I recently got some new RAM. I have 4 sticks of DDR4 3600 mhz RAM. When I purchased it I had gone onto Asus website and chose RAM that was listed as supported on my board. Yet when I enable XMP it...