When i added the url to my SC2-acc http://eu.battle.net/sc2/en/profile/684861/1/hiatus/ and then saved it under the game information category, the info on my profile doesnt seem to be updated?

The info in the link clearly states that im in platinum and the acc is named hiatus, but the info on my cg-profile shows that im in bronze and the acc is named Gustaf, which i changed from like 2 months ago.

Is it just that they dont keep the SC2-stuff updated, or possibly a bug?

Think it's more or less battle.net's problem.
Go to their forums and see if you can get some help there.
And what do you mean game information category?
link?

The profile on battle.net is fine and updated, but when you try to link it to the SC2-game information on your CG-profile the information that appears is old and not updated.

By Game Information i mean the column on your CG-profile where you can put in your ID's for the games you are playing etc