Unfortunately, there are multiple layers at work here.
1) Video settings selected for the system being used.
2) Browser being used and its zoom level settings for text and graphics.
3) The website being used and serving up images in various flavors and sizes, as it detects the type of browser and device you are on.
Instead of using POTN as a basis for sharing an image to see how it works (because AMASS has options beyond the browser options that could vary by person, and it is a "smart" site detecting what you are using to access the forum to render views differently), I would suggest using some random Google image as a metric for figuring out the issue, or some VBulletin based forum. It removes AMASS as a factor, leaving you with just points 1 and 2 to deal with. You then could try a common browser with the same settings to help minimize that as an agent for this problem.