I am unable to duplicate this, but I have a few theories possibly.  We break things into two sides of the equation, the text, which is what you see here, and for security reasons, its heavily stripped of stuff to keep the game and the users safe.  Then we have the "source" tab, where you can do basic HTML to format your stuff.  the nbsp is a HTML command of a forced space, browsers will ignore multiple spaces, but it will allow forced spaces.  Some plugins/extensions/addons don't know that we separate the stuff, so it may be adding it on the normal screen (which our system then treats it as regular text)  - Something like Grammarly or some other text massaging utility may be the culprit?

Try a different browser and let me know if that also does it.

Try it in incognito mode and let me know if that does it also.

Are you running any extensions/addons/plugins?

And finally, Can you send type up a short thing, click on Source, then screen shot that, and then post the reply here as well as the screen shot?

Thanks!

Lol, errors never happen when you want them to.