Self Employment tax (half) deduction disappears when 401k contribution maximized

[LLC4Me]

In past years (and perhaps I did it wrong), when I check the maximize 401k deduction box (for my sole proprietorship), it gives me a figure that I am allowed to deduct from my income ALONG WITH the standard (half) of my self employment taxes. This year (before) I hit Maximize, it showed my (half) S.E. Tax Deduction on schedule 1, but that went away when I checked the maximize box. Is there a way to keep that S.E tax deduction while maximizing? The S.E. Deduction is forever, while the maximize contribution will of course be taxed when it's pulled from the plan at retirement. (I lose my health insurance deduction as well).