they do that all the time. firms suck with the way they treat the interview process. before you come in they usually know whether they will hire you or not. however, they still have you come in. some firms, like the one you interviewed for, use 1L recruiting as a means of kinda pre-screening for their 2L summer class. Most likely they will allow you to skip screening interviews and extend you an offer right after callbacks next year, so there is a bright side to it.