Ok, I'm not seeing this problem with either version, or whether the Text and Font dialog is open or not. (I literally never use the Text and Font dialog, because until recently, everything I need is on the control bar. In recent Inkscape versions, they are adding new features to the Text and Font dialog. Maybe I'll need to use those features someday.)
But anyway, I can't reproduce your problem. Maybe it's related to using Inkscape on the Mac system? I don't think we have any....or at least not any regular members who provide support, who are Mac users.
I'm thinking we should report this as a bug. But let's get at least one more opinion on that, before we start the report. Someone else may know if it's already been reported. Or they may even know how to fix it.
If you type the same text a few different times, does it always show the same symbols? I wonder what the Unicode for those symbols are? Maybe somehow Inkscape thinks you're entering unicode (which is another way of creating symbols with text, in Inkscape).
Oh! Well there are some special issues for Mac users, especially regarding the Alt key, and Cmd key too, are common problems. Let me give you a link to that info, in case you aren't familiar. Maybe something there will explain the problem? Oh yes, and as I look at it, I see there's at least one issue with fonts. Maybe this will fix it:
https://inkscape.org/en/learn/faq/#mac-os-x-specific-issuesYou posted while I was typing. I can't install both OTF and TTF...or 2 OTF. But since I remembered about the Mac specific issues, you should look into that first. If that doesn't fix it, I'll try uninstalling the first OTF file and install the 2nd one.