How to check in Rules if a text field has changed?
First things first: your node:field-sucurity-audit token might contain a typo ... It could well be that you intended to use node:field-security-audit instead (see the difference?). If that is not the solution (yet), just keep reading ...

Also make sure to always (repeat: always) add an Entity has field condition BEFORE any other Rules Conditions in which you might want to refer to some field. So in your case you should add 2 such extra Rules Conditions (since you're checking the value of 2 different fields). That's also what is mentioned in the Rules UI, e.g. when you're adding a "data comparison" condition: somewhere it says:


  The data selector helps you drill down into the data available to Rules. To make entity fields appear in the data selector, you may have to use the condition 'entity has field' (or 'content is of type').


For a video tutorial that illustrates the importance of this Entity has field condition, refer to Data types and data selection, especially what is shown between about 13:30 and 17:30 in it.

PS: I'm assuming this is about D7 ...