It happened to me as well. You can call them and ask them to reverse it. I had one Amex card which had a cl of $8300. Recently I applied to a new Amex card and was instantly approved. Then I found out that my old Amex card 's cl dropped to $5000. I called Amex immediately. They told me that since I hadn't spent a lot with my old card, they just moved $3300 cl to the new card and bumped it to $5000 as well. I said I didn't feel comfortable with that move. Then they reversed the credit relocation and still granted $3000 cl on my new card. So I ended up with a little bit more combined credit limit.