If you would like to continue using Safari with the collector you need to disable a new feature that they added recently. If you go to the preferences panel, select "Privacy" and uncheck "disable cross site tracking".
Cross site tracking is what allows one site to leave a cookie that another site can use. This is how YLF knows you are logged in when you are on the Nordstrom page. I'm afraid that's the only way it can work right now.
Of course, some people are worried about cross site tracking's privacy implications. Many things on the web depend on it though. Mostly ad providers who want to target you with relevant ads. Also sites like Facebook, who can track when you go from their site to another website that uses some other kind of FB widget.
Normally with this sort of thing Safari would allow you to specify certain sites where you want to allow tracking, but that doesn't seem to be the case right now.
For an in between option, you can check the "ask websites not to track me" option. That will stop legitimate ad providers (and Facebook) from doing cross site tracking and serving you relevant ads, but it won't stop YLF's collector (which is not "tracking") or someone who ignores the request not to track.
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