This article applies to Classic Commerce. (Looking for Contextual Commerce documentation?)
When a customer begins his or her order in your live store, we don't want things like prices and visual styles changing on them in the middle of the process. So, if you are viewing links to your store, there's a good chance your session is cached from a session before you made the changes you are trying to see. If you close all browser windows and start with a fresh session, you should be able to see the changes. Or, if you use the Store Testing button in the upper right-hand corner, you will be able to see changes and test immediately.