Okay, sorry, I wasn't clear. Screenshot of details on two renders that are pretty close to size: one is a P11, the other is a P12 render. In both, the dimensions are rather close, yet the P11 JPG shows 300 dpi and the P12 image shows 72 dpi, even though in both I specified 300 DPI.

I may be dense, but I need small words to explain this to me--I'm not a computer expert, I'm not a printing expert, I just noticed that this is happening.

Poser 11 render:

Poser 12: