Maximize Contribution to Individual 401(k) under Business taking into account Personal 401(k)?

I chose "Maximize Contribution to Individual 401(k)" under Business and it gave me $27866 on a $50000 business income. I also already contributed $18000 to a 401(k) from my Personal W2 job, which was added in the personal section. Is the $27866 taking that into account, or is it incorrectly adding $18000? i.e. should I really only be able to contribute $9866 for my Individual 401(k)?