Aye, it worked perfectly fine with my old PC before it died. If I had another mouse handy I'd try that next, so I might see about changing various settings and see if I can get it to work. Funnily enough, even when I try setting up a macro on my keyboard to do mouse-wheel down or up (which in other windows it works to scroll the page), still nothing on TIFA, so I'm wondering if I just don't have something quite installed that might be required yet on my new and fresh PC?
Edit: Okay, so somehow, when I enter full screen mode with TIFA with alt+enter, it seems to fix the issue~! I have no idea why it does, but atleast I seem to have a working solution even if I just have to remember to do it anytime I launch it. I'm going to assume I have a setting somewhere that I toggled on the old PC, and might have to re-toggle on the new one... no idea what though x3