Safari text scaling issues

Already made several posts about this that are already dead so I guess I have to just keep recreating the same post. Why can't Safari keep text at the same size? I've never had this many issues with such a basic function of a browser. Text size repeatedly just "shrinks" (doesn't seem to matter how I set the scaling options in Safari). The only "fix" is to exit fullscreen (which I have to do about 20 times a day to get the text back to a legible size). I don't have any extensions enabled and I've already tried "remove all" website data. I guess my only recourse is to reinstall the OS on my 3 month old computer and (hope) that this issue doesn't come back immediately after a major hassle all because Apple can't make a browser with legible font