Golden Key count not incrementing

3/26/15 Entered a code for 25 keys(thought it was for 5). Count did not change.
4/4/15 Entered a code for 5 keys. Count did not change
4/5/15 entered a code for 5 keys. Count did not change.

Opening the chest decrements the count.

BL2 GOY PS3

Similar issue here. On PS4, Borderlands: The Handsome Collection. I enter the codes and it accepts them, but my count does not increase. The first time, I got 25. The next time, it took away 2 (instead of getting 5) and then today it gave me 2 (instead of 5). What the deal?