Why does `decode-dimms` report my CL-18 RAM timings as 22-22-22-52?

I replaced my laptop's RAM. I believe the new RAM should have a latency of 18CL at 3200MT/s. But decode-dimms lists the timings as "A-RCD-RP-RAS (cycles) as DDR4-3200 22-22-22-52". Why is the CAL latency (the first 22) not 18?

The RAM is two 16GB modules: F4-3200C18-16GRS, listing timings of "3200 CL18-18-18".

The laptop is a System76 Gazelle (gaze17), which lists memory capacity as "Up to 64GB (2x32GB) dual-channel DDR4 SO-DIMMs @ 3200 MHz".

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Why does `decode-dimms` report my CL-18 RAM timings as 22-22-22-52?

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