unexpected double spacing

Been using Scrivener successfully for more than a year as a screenwriter. Today, there is unstoppable double spacing when you tab for character name. I can’t find out how to make it stop. Please,someone, advise. Let me also add that when I initially hit tab, it refuses to even single space. i have to hit enter to space it and that’s when i get double space, not single space.

So, to recap. NO spacing. But when I hit enter to force single spacing i get, instead, double spacing. Very annoying!