On my iPad, does Facebook usually get my ip address and login time wrong?

I want into my Facebook settings on my iPad to check my login history and it showed that I was logged in 2 days ago with a different ip address, yet I didn't log into my Facebook 2 days ago. I was always online. Normally this would mean someone had access to my Facebook account. But what's ODD is that if my account was being logged into a new device in a different location, I would have gotten an email and notification about it 2 days ago to alert me of this incident, but I didn't. Better to be safe then sorry, I ended the session and change the password. But I'm still worried. What does this mean?! Does Facebook get my ip address and the timing wrong? Please help. Thank you

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