Why can't stores give accurate erev shabbat hours?

In the past 2 weeks, I've encountered 2 kosher restaurants, one a sushi place, and one a pizza parlor, that closed early on Friday.

In both cases, the website (and in the case of the pizza parlor, a sign on the door as well,) clearly stated that they closed on Friday 2 hours before Shabbat. So why were they already closed a good 4 or 5 hours before candelighting?

Not a big deal in the scheme of things, but annoying nonetheless. How hard is it to write on the website: "please call before coming on Fridays to verify hours"??

Sent from my Verizon Wireless BlackBerry