Widget Component Fails to Properly Highlight Text

I’m using a widget component to act as a sort of desktop within the game. There’s a multi-line text box that can highlight text, but doing so produces odd results (see gif below). Strangely enough, this only happens in when I launch as Standalone. It works completely fine playing in Selected Viewport. If I put a multi-line text box in the overall UI, it works fine there too. It’s just the widget component that’s behaving improperly. Can anyone lend some assistance?

Above is when playing in Standalone.

Above is when playing in Selected Viewport.