Scrivener randomly adding extra sets of quotes

Scrivener adds in extra quotes in various spots throughout my manuscript. It will import fine, but then as I do editing and save, the next time I open it I find extra double quotes or single quotes that I have to go in and fix. Given this is a full size novel, this is tedious and irritating. Am I missing a setting that can take care of this problem?

Example: “Let’s go for a walk,” the man said to the tall lady in red standing next to him.

Scrivener will then randomly turn some sentences into something like this upon the next open: “Let’’s go for a walk,”” the man said to the tall lady in red standing next to him.

What can I do to prevent this?