Confused on why solo 401k calculator says employee contribution is $15k instead of $23.5k?

I am in independent cotractor and earned around 320k in 2025. Around 30k in expenses so plugged in 290k for net profit in this solo 401k calculator: [https://obliviousinvestor.com/solo-401k-contribution-calculator/](https://obliviousinvestor.com/solo-401k-contribution-calculator/) It spit out: * An employee contribution of $15k plus * An employer contribution of $55k I was expecting the employee amount to be $23.5k, no?