Bug with border in css

When I give an item: border-right: 1px solid #34495e; Bootstrap studio will replace the second space with &'nbsp'; Because of this the border wouldn't be displayed.

So this is what I see in the browser when I look at the css with Inspect Elements. border-right: 1px solid&'nbsp';#34495e

I am unable to reproduce this not matter how I've done it. In a CSS file, inline style etc...