Just to add a bit to Muss's post, Zen 2 advice will also apply to Zen 3 (5000 series). A 4xDR setup at 3600 is definitely possible if your CPU's IOD is great, your settings are correct and your motherboard topology helps, but newer versions of AGESA are very important.
Since you're on a R5 3600 (which isn't really a very good bin), you should raise your VSOC a bit as advised an err more or less on the conservative side for timings and target frequency. You probably won't feel much of a difference if you choose to target DDR4-3200 and 1600 FCLK instead, and it will be
much easier to achieve.
It also really sounds like there is SPD corruption in one of the DIMMs, you should double check with HWiNFO64 if the sticks' SPD data really mismatches. If so, RMA your memory. Also, if at all possible, take your time to read a bit on how DDR4 works and the optimization tricks for each IC, which are well established by now. Set-and-forget XMP rarely works perfectly, no matter the platform, so hand-tuning will allow you to have an excellent set for years to come. It's a bit of work, but it's worth it. I've been using my settings for roughly 3 years now, and it's been through Zen 2 and 3, rock solid.
I'm pretty proud of my settings here, one of the chief reasons I am not too fancy on going to DDR5 just yet, these are Dominator Platinums (some weird B-die downbin that are factory rated at 3000, but run 3600 without even trying) that run ice cold, it might not be the best latencies around, but it's super stable and reliable, will pass any test no matter how strict and only using 1.375V at such low VSOC too:
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