OK, this is what happened. I uploaded the screenshot, and the font in the sig changed to much smaller, (1/2 size?), exposing all the text. After I navigated away from the page and returned, the text was back to its original size, and half hidden. Apparently the text size in the attachment somehow temporarily effected the text size in the box overall.
It's not the browser. I'm using Opera, in stock form. Firefox is where I have script blocking installed, but I no longer use that browser for this site. Both browsers render the page identically.
I have two suspicions about what is causing the issue. the 1st is the portrait orientation on my monitor. (Which BTW, displays more story / thread listings than the landscape mode), or the god forsaken G-41 IGP in this ancient turd of a computer....OR....doctoring the pages for better rendering on mobile, has tampered with desktop rendering. (OK granted, that was 2 1/2 suspicions). So a scaling fault on this machine maybe?
Your screenshot, is exactly what my screen looked like, at the moment I uploaded the attachment, and for as long as I stayed on the page. I swear my 15 year old eMachines with Intel 915 graphics is more reliable than this thing. It just won't run video well.