At 9 and 18 months your cards are out of steps but unfortunately are 'bucketed'. You can search the forums for 'asset backed securities' (ABS) to understand more about it.
It's borderline rare for Cap1 to unbucket cards so what many do is wait until after your next cli on both, then combine the newer into the older. The closed tradeline will still report for 10 years so combination will not affect your credit score by closing one card.
After that, just be patient, keep your cards in order, and let your score climb a little more before trying Cap1 again as you'll likely end up in the same bucket.
