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It is probably the limit. Usually when you get a temporary starting limit it is low like $500 or $1000. Synchrony will set a starting limit at $1000 until your card arrives and then the normal limit will kick in. I have also heard that US Bank at times gives a temporary limit of $500 and when you get the card it says the real limit.
Woo hoo! Congratulations and well done. Thanks for sharing your story!