They all look mostly the same. The first screenshot must be the vB 3.x - Fluid because that one has a slightly different color scheme. Otherwise I don't see any difference which is odd. If you look at the three from a desktop you can definitely see the difference and I was hoping that the vB 3.x - Fixed, which uses a fixed width, would resolve the issue. Thank you for taking the time to test that for me and letting me know what you found. I messaged you in the conversation about this and the resource feature.
I've added a iPhone specific version of the Default theme called "Default - iPhone" that I believe resolves the iPhone and iPod rendering issue. Let me know what you i-product guys see when using "Default - iPhone".