Every time I open the WebStorm IDE, my editor theme changes to some different theme, other than what I have selected prior to closing, but the project windows shows the correct theme. So just the Editor theme changes. I also received this message
"If you don't see the correct UI theme, make sure it's selected in Settings > Appearance & Behavior > Appearance > Theme"
So I had to change it on every load. It could be that I accidently enabled some setting but I am not sure which one is it.