Issue with passwords

Recently, I've had an issue with several of my passwords. When I type them in on several websites, the site directs me back to where I log in. However, when I type the wrong password, the websites inform me of it. I also discovered on another computer, some of the passwords do work. Anyone have any ideas what the problem might be and how to fix it?

I'm using safari on a MacBookPro if that might show what the issue is.

the problem is that the browser isn't accepting cookies.

Yep, that's what it was.