rendering

We upgraded the other day to XF 2.1 (we have not updated to the version that came out earlier today).. People w/ Mac's (MacOS Mojave + Safari 12.0.3) seem to be seeing quotes and apostrophe's rendered as follows. I've actually tried Chrome and Firefox and get the same results. A sample page in...

There are probably a lot of examples like this in the RM, but I can't seem to find any to provide me an example of this. At a basic level, all I want to do is change the content of posts/messages displayed on a page. Not the db values, just as they are rendered. Using the thread view as a...