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Nakamura was not touched.

Nakamura550's current ratings were set to 1; his potential ratings were set to 550.

Nakamura600's current ratings were set to 1; his potential ratings were set to 600.

I then played them at the same time and moved them up a level each month.

The first two performed as we'd expect. The third didn't. That suggests it's a bug.

I'm assuming nobody caught this because, and I haven't checked, newly created players don't exceed 550. They only raised the limit to catch the most extreme outliers, who'd only get assigned a rating above 550, if they were playing in the majors.