Am I getting ripped off by this lender?

[Zachary Schimenz]

I'm buying my first house, using US Bank as a lender. During the preapproval process the guy told me my interest rate would be in the low 4's. Now that I sent in the actual property and he's saying it's 5.5%!! Which is WAY more per month than 4%.

Is this typical? Is it like a "bait and switch" technique or am I overthinking it?

My credit score is about 760, so I thought I'd get a much better rate than that. 

Thanks, and I'd appreciate any input you have on this,

-Zach