Can anyone please check this and verify my results?

I was looking at View Ranges for my VK 28.01 and had the following weirdness show up:

Using Recon only the View Range was 398.6
Using BIA only, the View Range was 398.4

That alone seems weird because BIA should be slightly higher than Recon, not lower. But it gets weirder…

With Recon and Coated Optics my View Range was 437.2
With BIA and Coated Optics my View Range was 438.2

Somehow adding Coated Optics made BIA better than Recon. But it gets weirder…

With Recon, Coated Optics and Chocolate, my View Range was 457.2
With BIA, Coated Optics and Chocolate my View Range was 456.6

Adding Chocolate somehow made Recon better than BIA again.

Can anyone duplicate these results?

And can anyone explain how they might be valid?