Website opens a new tab and loses my login information

I open (for example) "" in a new tab and login with my username and password. I then click on one of the options to print coupons. It then loads that page in a new tab instead of the one I'm in, and loses my login information, making me login again. As soon as I do that and click on the option to load coupons, it opens another new tab and again loses my login. It does this in other websites as well. It was working okay for several weeks, and started this suddenly, but I can't figure out what changed.

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