Make sure you've filled in as much of the date into the Article search screen as possible. The A-Z list matches what you've entered with what is in the WorldCat knowledge base then takes you to the first provider in the list that matches all the qualifications. If there is no year or month in the search qualifications, it won't be able to apply date coverage.
If you've filled in the article search screen completely and still go to the wrong provider, please contact OCLC Support with the following information:
There is more information about the A-Z Link Resolver.