huh... My game has glitched out similarly before... I'd say to just quit & re-launch, terminate program using task manager if the game is frozen due to this, but if it continues to happen even after re-launching then I honestly have no idea!
I suggest either using thee hyphens (- - - without spaces) between paragraphs, or one > symbol as long as there's an empty line on both sides. The line will probably look neater. Or you could just add a transparent image ~50 pixels high between the paragraphs.