Even though I see the activity entries in my account, others can see it.
I'm assuming you meant *can't* see it?
Once your action is approved, it should be possible for other users to see it on your Feed. However, not all actions will always show on your Feed. Facebook chooses which actions appear to each user based on social relevance to that user, popularity of the action, and a lot of other information that Facebook uses. In addition to the Timeline feed, there's also the Ticker of activity that friends can see of actions their friends are taking. The Ticker is much more likely to show the action since it's supposed to be a current stream of what people are doing.
So, Actions aren't guaranteed to go out to everyone, but as more actions are taken on your site, the more likely that more users and friends will see it.
Finally, in the Activity Log on Facebook, next to each action is a little circle. If you click that circle, you can change the behavior of the action to force it on your Timeline feed, hide it from your Timeline feed, or let Facebook choose whether it's shown (the default).
Hope that helps explain,
Alex