Yup, that's why they recomment talking to an immigration lawyer about travel. Shud have a very convincing reason to go to Nepal and come back otherwise the POE officer would say, "So you were staying in US for years unlawfully, you got TPS which is given on the basis that you guys cannot go back or deported back to your country because of recent earthquake and yet here you are, travelled to ur contry right after getting TPS....hmmm...let me think, i personally believe its safe for you to travel to Nepal.....so....."