Just had this happen:
1/5/16 AMEX SPG Approved
1/11/16 AMEX Hilton (no fee) Approved
2/17/16 AMEX Hilton (Surpass) App cancelled, too many card.
Called and talked with a rep who said "there is no problem, but you applied for the same card twice, so we automatically cancelled your application." I tried to explain they weren't the same card but the difference was lost on him. Told me to take it up with customer service.