Opened Firefox today, History Today shows me sites I haven't visited for days. Why would this happen?

Was in the History to get to a site I visited earlier this morning, but it is claiming that I visited a handful of sites from a training that I took last week.
Since it was a site I have been to, I no longer suspect anything suspicious. Why would Firefox tell me that I've visited sites today that I haven't?
This was on a Mac computer with Firefox v20.

You can check for problems with the <b>places.sqlite</b> database file in the Firefox profile folder.
*http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
*https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file
You can also look at the above mentioned Places Maintenance extension.

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