Outlook settings at 120 DPI continue to baffle me.

(1) My Outlook automatically upgraded from 2013 to 2016 and I noticed a lot of my templates @ 120 DPI broke in 2016 when they were working in 2013 - I thought Outlook 2016 was essentially the same HTML rendering engine?

(2) Litmus's Outlook 2013 120 DPI screenshot seems buggy potentially. Upon first load, images don't scale in the screenshot, however, when reloading 2x or 3x (without making any changes to the code) the images will scale according to the DPI and the layouts aren't broken - has anyone else encountered this behavior? Not sure if there is a workaround or if this is just a Litmus bug?