I just replied to your other thread before I spotted this one. D'oh!
Going by the colour of the telson (sting), your scorpion looks like it is an adult so it will not moult again. It's normal for the membrane to be visible slightly between the tergites and along the side of an adult scorpion. Your scorpion doesn't look overly fat, although if it continues to enlarge it may turn out that you have a gravid female.
Your new pet has probably had weeks of stressful experiences before it came in to your care. It was likely wild collected somewhere in South East Asia, put into crates with hundreds of other scorpions, had a bumpy ride to dealer in Thailand/Malaysia etc., flown to an exotics wholesaler in the USA, shipped again to whoever the seller was at Repticon, put on display in a busy hall full of people and finally moved again to come home with you.
The best advice I can give you is to just leave it alone for a week or two. Ensure it has a deep and damp substrate (at least 4'') for it to burrow into, fresh water, temperatures in the 80 - 85f range, and a tank sited away from lights, noise and vibrations. Let it settle down, start a burrow and feel safe.