iPhone 5 LTE signal issues

[john_c1]

I work in Little Rock and there should be no issues with signal.  In the parking lot at work, I get a full 5 bars and speedtest.net app has shown 41-47 Mbps download speeds.  When I walk in the building, the signal drops to around 2 bars.  I thought I'd get a better signal in the office than I did with AT&T, which is why I switched.  There's been 1 time I've seen a full 5 bar signal in the office, but then it dropped down to 2 again.  Is there something wrong with the cell site in this area?

Here are some pics of the field test screens in the parking lot, mabe 100 yards from where I'm at inside the office.

Here are screen shots from in the office.