Interesting behavior and wondering if there is a good explanation.. (add MORE bonds to tax deferred only and end up with MORE effective savings at the end)

I am using Allocation Mode 2. I have a 65/35 overall and a various allocations amongst Roth, Taxable, Inherited and Tax Deferred accounts.

I start with 2 identical scenarios.

I change a single parameter in one of the scenarios - I make my tax deferred MORE conservative (add more bonds and less stocks)

My effective ending balance goes UP!

So, by getting MORE conservative in the tax deferred, I end up with MORE money.

I found that to be a curious result and I am wondering if perchance anyone can fathom why that might be. I suspect it is related to less IRMAA and other taxes down the road, but, well, I am gobsmacked by the result. Anyone see that kind of effect as they are playing around? Or, as is quite possible, I set something that is causing things to skew..

Thanks-

Chris