d Cir. 2007) (internal quotations and citations omitted). Therefore, "we are required to raise issues of standing sua sponte if such issues exist." Addiction Specialists, Inc. v. Twp. of Hampton, 411 F.3d 399, 405 (3d Cir. 2005) (internal quotations and citations omitted). Prior to reaching the merits of Statebridge's moti