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Congrats on your approval, Cap1 doesn't like extending credit for everyone if you ask me.
Does your QS get a lot of spend? Capital One could be thinking you're just not going to use the card. Since you have the DC, I'm assuming the answer is no on the QS spend.
Your scores imo are fine for a higher CL cap1 card as what they consider excellent credit would make other lenders giggle. Many factors go into limit other than scores. Your whole profile, etc. Still strange a lower CL than your previous card imo.
Might it be your utilization? I've gotten a couple "you are a valued customer" "pre-approved for _____" messages on my CapOne home page. II don't remember exact wording, but it states that if my credit has changed, usage is different than when offer was extended, they may not approve, or give lower limits, etc.