First off, welcome to the forums!! You've come to the right place to learn. We will do our best to help you. Please do not take offense at anything we might say - keep in mind that our primary concern is for the snake's well being.
Second,
Read the CARESHEET. It's the single most important link in learning proper care of your new snake.


Your BP is dehydrated plain and simple. There may be other things going on, but this is the first thing that is obvious from the photos. Humidity is way too low and temp is way too high. Start misting every day. Humidity is hard to keep up in a tank, but we'll start there. It should be at about 70%.
Get rid of the lights - BPs don't need UVB light or any type of light at all. They'll raise the temps too high and suck out humidity even more. Your UTH (I assume you're using a UTH?? If not, are the lights the only heat source???) MUST be on a thermostat!! ANY and EVERY heat souce MUST be regulated with a t-stat to control the temps. Temps that are too high can cause irreversable neurological damage - and 2 weeks is long enough for that to have happened.
You want your
hotspot only to be no more than 90-92 and your
ambient temp should be no more than 80.
Get rid of those analog round dials for measuring temp and humidity. They don't work no matter where you put them in the tank. Pick up an Accurite indoor/outdoor thermometer/hygrometer combo from Walmart (only about $12). It is digital and accurate.
Your 1/2 log hide is WAY too big. BPs like snug and secure hiding places. Try the
hide boxes from Reptile Basics. 2 of these are what you want - one for the cool side and one for the hot side.
I don't mean to point out everything that is wrong with your setup. But Petsmart employees are notorious for selling someone things they don't need and for giving poor or downright wrong information. That seems to have happened to you. We'll do our best to help you help your snake!
